Calculus Examples

$lim_{x \to 3} \frac{\sqrt{x^{2} - 2 x + 6} - \sqrt{x^{2} + 2 x - 6}}{x^{2} - 4 x + 3}$

Step 1

Apply L'Hospital's rule.

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Step 1.1

Evaluate the limit of the numerator and the limit of the denominator.

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Step 1.1.1

Take the limit of the numerator and the limit of the denominator.

$\frac{lim_{x \to 3} \sqrt{x^{2} - 2 x + 6} - \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2

Evaluate the limit of the numerator.

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Step 1.1.2.1

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{lim_{x \to 3} \sqrt{x^{2} - 2 x + 6} - lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.2

Move the limit under the radical sign.

$\frac{\sqrt{lim_{x \to 3} x^{2} - 2 x + 6} - lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.3

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{\sqrt{lim_{x \to 3} x^{2} - lim_{x \to 3} 2 x + lim_{x \to 3} 6} - lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.4

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - lim_{x \to 3} 2 x + lim_{x \to 3} 6} - lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.5

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + lim_{x \to 3} 6} - lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.6

Evaluate the limit of $6$ which is constant as $x$ approaches $3$ .

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6} - lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.7

Move the limit under the radical sign.

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6} - \sqrt{lim_{x \to 3} x^{2} + 2 x - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.8

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6} - \sqrt{lim_{x \to 3} x^{2} + lim_{x \to 3} 2 x - lim_{x \to 3} 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.9

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6} - \sqrt{{(lim_{x \to 3} x)}^{2} + lim_{x \to 3} 2 x - lim_{x \to 3} 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.10

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6} - \sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - lim_{x \to 3} 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.11

Evaluate the limit of $6$ which is constant as $x$ approaches $3$ .

$\frac{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6} - \sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.12

Evaluate the limits by plugging in $3$ for all occurrences of $x$ .

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Step 1.1.2.12.1

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\sqrt{3^{2} - 2 lim_{x \to 3} x + 6} - \sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.12.2

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} - \sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.12.3

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} - \sqrt{3^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.12.4

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13

Simplify the answer.

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Step 1.1.2.13.1

Simplify each term.

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Step 1.1.2.13.1.1

Raise $3$ to the power of $2$ .

$\frac{\sqrt{9 - 2 \cdot 3 + 6} - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.2

Multiply $- 2$ by $3$ .

$\frac{\sqrt{9 - 6 + 6} - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.3

Subtract $6$ from $9$ .

$\frac{\sqrt{3 + 6} - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.4

Add $3$ and $6$ .

$\frac{\sqrt{9} - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.5

Rewrite $9$ as $3^{2}$ .

$\frac{\sqrt{3^{2}} - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.6

Pull terms out from under the radical, assuming positive real numbers.

$\frac{3 - \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.7

Raise $3$ to the power of $2$ .

$\frac{3 - \sqrt{9 + 2 \cdot 3 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.8

Multiply $2$ by $3$ .

$\frac{3 - \sqrt{9 + 6 - 1 \cdot 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.9

Multiply $- 1$ by $6$ .

$\frac{3 - \sqrt{9 + 6 - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.10

Add $9$ and $6$ .

$\frac{3 - \sqrt{15 - 6}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.11

Subtract $6$ from $15$ .

$\frac{3 - \sqrt{9}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.12

Rewrite $9$ as $3^{2}$ .

$\frac{3 - \sqrt{3^{2}}}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.13

Pull terms out from under the radical, assuming positive real numbers.

$\frac{3 - 1 \cdot 3}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.1.14

Multiply $- 1$ by $3$ .

$\frac{3 - 3}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.2.13.2

Subtract $3$ from $3$ .

$\frac{0}{lim_{x \to 3} x^{2} - 4 x + 3}$

Step 1.1.3

Evaluate the limit of the denominator.

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Step 1.1.3.1

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{0}{lim_{x \to 3} x^{2} - lim_{x \to 3} 4 x + lim_{x \to 3} 3}$

Step 1.1.3.2

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{0}{{(lim_{x \to 3} x)}^{2} - lim_{x \to 3} 4 x + lim_{x \to 3} 3}$

Step 1.1.3.3

Move the term $4$ outside of the limit because it is constant with respect to $x$ .

$\frac{0}{{(lim_{x \to 3} x)}^{2} - 4 lim_{x \to 3} x + lim_{x \to 3} 3}$

Step 1.1.3.4

Evaluate the limit of $3$ which is constant as $x$ approaches $3$ .

$\frac{0}{{(lim_{x \to 3} x)}^{2} - 4 lim_{x \to 3} x + 3}$

Step 1.1.3.5

Evaluate the limits by plugging in $3$ for all occurrences of $x$ .

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Step 1.1.3.5.1

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{0}{3^{2} - 4 lim_{x \to 3} x + 3}$

Step 1.1.3.5.2

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{0}{3^{2} - 4 \cdot 3 + 3}$

Step 1.1.3.6

Simplify the answer.

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Step 1.1.3.6.1

Simplify each term.

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Step 1.1.3.6.1.1

Raise $3$ to the power of $2$ .

$\frac{0}{9 - 4 \cdot 3 + 3}$

Step 1.1.3.6.1.2

Multiply $- 4$ by $3$ .

$\frac{0}{9 - 12 + 3}$

Step 1.1.3.6.2

Subtract $12$ from $9$ .

$\frac{0}{- 3 + 3}$

Step 1.1.3.6.3

Add $- 3$ and $3$ .

$\frac{0}{0}$

Step 1.1.3.6.4

The expression contains a division by $0$ . The expression is undefined.

Undefined

$\frac{0}{0}$

Step 1.1.3.7

The expression contains a division by $0$ . The expression is undefined.

Undefined

$\frac{0}{0}$

Step 1.1.4

The expression contains a division by $0$ . The expression is undefined.

Undefined

$\frac{0}{0}$

Step 1.2

Since $\frac{0}{0}$ is of indeterminate form, apply L'Hospital's Rule. L'Hospital's Rule states that the limit of a quotient of functions is equal to the limit of the quotient of their derivatives.

$lim_{x \to 3} \frac{\sqrt{x^{2} - 2 x + 6} - \sqrt{x^{2} + 2 x - 6}}{x^{2} - 4 x + 3} = lim_{x \to 3} \frac{\frac{d}{d x} [\sqrt{x^{2} - 2 x + 6} - \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3

Find the derivative of the numerator and denominator.

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Step 1.3.1

Differentiate the numerator and denominator.

$lim_{x \to 3} \frac{\frac{d}{d x} [\sqrt{x^{2} - 2 x + 6} - \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.2

By the Sum Rule, the derivative of $\sqrt{x^{2} - 2 x + 6} - \sqrt{x^{2} + 2 x - 6}$ with respect to $x$ is $\frac{d}{d x} [\sqrt{x^{2} - 2 x + 6}] + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]$ .

$lim_{x \to 3} \frac{\frac{d}{d x} [\sqrt{x^{2} - 2 x + 6}] + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3

Evaluate $\frac{d}{d x} [\sqrt{x^{2} - 2 x + 6}]$ .

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Step 1.3.3.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{2} - 2 x + 6}$ as ${(x^{2} - 2 x + 6)}^{\frac{1}{2}}$ .

$lim_{x \to 3} \frac{\frac{d}{d x} [{(x^{2} - 2 x + 6)}^{\frac{1}{2}}] + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = x^{2} - 2 x + 6$ .

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Step 1.3.3.2.1

To apply the Chain Rule, set $u_{1}$ as $x^{2} - 2 x + 6$ .

$lim_{x \to 3} \frac{\frac{d}{d u_{1}} [{u_{1}}^{\frac{1}{2}}] \frac{d}{d x} [x^{2} - 2 x + 6] + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{1}} [{u_{1}}^{n}]$ is $n {u_{1}}^{n - 1}$ where $n = \frac{1}{2}$ .

$lim_{x \to 3} \frac{\frac{1}{2} {u_{1}}^{\frac{1}{2} - 1} \frac{d}{d x} [x^{2} - 2 x + 6] + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.2.3

Replace all occurrences of $u_{1}$ with $x^{2} - 2 x + 6$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1} \frac{d}{d x} [x^{2} - 2 x + 6] + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.3

By the Sum Rule, the derivative of $x^{2} - 2 x + 6$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [6]$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1} (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [6]) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.4

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1} (2 x + \frac{d}{d x} [- 2 x] + \frac{d}{d x} [6]) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.5

Since $- 2$ is constant with respect to $x$ , the derivative of $- 2 x$ with respect to $x$ is $- 2 \frac{d}{d x} [x]$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1} (2 x - 2 \frac{d}{d x} [x] + \frac{d}{d x} [6]) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.6

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1} (2 x - 2 \cdot 1 + \frac{d}{d x} [6]) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.7

Since $6$ is constant with respect to $x$ , the derivative of $6$ with respect to $x$ is $0$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.8

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.9

Combine $- 1$ and $\frac{2}{2}$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.10

Combine the numerators over the common denominator.

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1 - 1 \cdot 2}{2}} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.11

Simplify the numerator.

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Step 1.3.3.11.1

Multiply $- 1$ by $2$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{1 - 2}{2}} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.11.2

Subtract $2$ from $1$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{\frac{- 1}{2}} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.12

Move the negative in front of the fraction.

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{- \frac{1}{2}} (2 x - 2 \cdot 1 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.13

Multiply $- 2$ by $1$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{- \frac{1}{2}} (2 x - 2 + 0) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.14

Add $2 x - 2$ and $0$ .

$lim_{x \to 3} \frac{\frac{1}{2} {(x^{2} - 2 x + 6)}^{- \frac{1}{2}} (2 x - 2) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.15

Combine $\frac{1}{2}$ and ${(x^{2} - 2 x + 6)}^{- \frac{1}{2}}$ .

$lim_{x \to 3} \frac{\frac{{(x^{2} - 2 x + 6)}^{- \frac{1}{2}}}{2} (2 x - 2) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.3.16

Move ${(x^{2} - 2 x + 6)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) + \frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4

Evaluate $\frac{d}{d x} [- \sqrt{x^{2} + 2 x - 6}]$ .

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Step 1.3.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{2} + 2 x - 6}$ as ${(x^{2} + 2 x - 6)}^{\frac{1}{2}}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) + \frac{d}{d x} [- {(x^{2} + 2 x - 6)}^{\frac{1}{2}}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.2

Since $- 1$ is constant with respect to $x$ , the derivative of $- {(x^{2} + 2 x - 6)}^{\frac{1}{2}}$ with respect to $x$ is $- \frac{d}{d x} [{(x^{2} + 2 x - 6)}^{\frac{1}{2}}]$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - \frac{d}{d x} [{(x^{2} + 2 x - 6)}^{\frac{1}{2}}]}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = x^{2} + 2 x - 6$ .

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Step 1.3.4.3.1

To apply the Chain Rule, set $u_{2}$ as $x^{2} + 2 x - 6$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{d}{d u_{2}} [{u_{2}}^{\frac{1}{2}}] \frac{d}{d x} [x^{2} + 2 x - 6])}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.3.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{2}} [{u_{2}}^{n}]$ is $n {u_{2}}^{n - 1}$ where $n = \frac{1}{2}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {u_{2}}^{\frac{1}{2} - 1} \frac{d}{d x} [x^{2} + 2 x - 6])}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.3.3

Replace all occurrences of $u_{2}$ with $x^{2} + 2 x - 6$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1} \frac{d}{d x} [x^{2} + 2 x - 6])}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.4

By the Sum Rule, the derivative of $x^{2} + 2 x - 6$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [2 x] + \frac{d}{d x} [- 6]$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1} (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [2 x] + \frac{d}{d x} [- 6]))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.5

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1} (2 x + \frac{d}{d x} [2 x] + \frac{d}{d x} [- 6]))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.6

Since $2$ is constant with respect to $x$ , the derivative of $2 x$ with respect to $x$ is $2 \frac{d}{d x} [x]$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1} (2 x + 2 \frac{d}{d x} [x] + \frac{d}{d x} [- 6]))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.7

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1} (2 x + 2 \cdot 1 + \frac{d}{d x} [- 6]))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.8

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6$ with respect to $x$ is $0$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.9

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.10

Combine $- 1$ and $\frac{2}{2}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.11

Combine the numerators over the common denominator.

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1 - 1 \cdot 2}{2}} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.12

Simplify the numerator.

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Step 1.3.4.12.1

Multiply $- 1$ by $2$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{1 - 2}{2}} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.12.2

Subtract $2$ from $1$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{\frac{- 1}{2}} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.13

Move the negative in front of the fraction.

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{- \frac{1}{2}} (2 x + 2 \cdot 1 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.14

Multiply $2$ by $1$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{- \frac{1}{2}} (2 x + 2 + 0))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.15

Add $2 x + 2$ and $0$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{1}{2} {(x^{2} + 2 x - 6)}^{- \frac{1}{2}} (2 x + 2))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.16

Combine $\frac{1}{2}$ and ${(x^{2} + 2 x - 6)}^{- \frac{1}{2}}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - (\frac{{(x^{2} + 2 x - 6)}^{- \frac{1}{2}}}{2} (2 x + 2))}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.4.17

Move ${(x^{2} + 2 x - 6)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$lim_{x \to 3} \frac{\frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} (2 x - 2) - \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}} (2 x + 2)}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.5

Reorder terms.

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{\frac{d}{d x} [x^{2} - 4 x + 3]}$

Step 1.3.6

By the Sum Rule, the derivative of $x^{2} - 4 x + 3$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [3]$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [3]}$

Step 1.3.7

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [3]}$

Step 1.3.8

Evaluate $\frac{d}{d x} [- 4 x]$ .

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Step 1.3.8.1

Since $- 4$ is constant with respect to $x$ , the derivative of $- 4 x$ with respect to $x$ is $- 4 \frac{d}{d x} [x]$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x - 4 \frac{d}{d x} [x] + \frac{d}{d x} [3]}$

Step 1.3.8.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x - 4 \cdot 1 + \frac{d}{d x} [3]}$

Step 1.3.8.3

Multiply $- 4$ by $1$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x - 4 + \frac{d}{d x} [3]}$

Step 1.3.9

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x - 4 + 0}$

Step 1.3.10

Add $2 x - 4$ and $0$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 {(x^{2} - 2 x + 6)}^{\frac{1}{2}}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x - 4}$

Step 1.4

Convert fractional exponents to radicals.

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Step 1.4.1

Rewrite ${(x^{2} - 2 x + 6)}^{\frac{1}{2}}$ as $\sqrt{x^{2} - 2 x + 6}$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 \sqrt{x^{2} - 2 x + 6}} - (2 x + 2) \frac{1}{2 {(x^{2} + 2 x - 6)}^{\frac{1}{2}}}}{2 x - 4}$

Step 1.4.2

Rewrite ${(x^{2} + 2 x - 6)}^{\frac{1}{2}}$ as $\sqrt{x^{2} + 2 x - 6}$ .

$lim_{x \to 3} \frac{(2 x - 2) \frac{1}{2 \sqrt{x^{2} - 2 x + 6}} - (2 x + 2) \frac{1}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.5

Combine factors.

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Step 1.5.1

Multiply $2 x - 2$ by $\frac{1}{2 \sqrt{x^{2} - 2 x + 6}}$ .

$lim_{x \to 3} \frac{\frac{2 x - 2}{2 \sqrt{x^{2} - 2 x + 6}} - (2 x + 2) \frac{1}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.5.2

Multiply $- (2 x + 2)$ by $\frac{1}{2 \sqrt{x^{2} + 2 x - 6}}$ .

$lim_{x \to 3} \frac{\frac{2 x - 2}{2 \sqrt{x^{2} - 2 x + 6}} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6

Reduce.

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Step 1.6.1

Cancel the common factor of $2 x - 2$ and $2$ .

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Step 1.6.1.1

Factor $2$ out of $2 x$ .

$lim_{x \to 3} \frac{\frac{2 (x) - 2}{2 \sqrt{x^{2} - 2 x + 6}} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.1.2

Factor $2$ out of $- 2$ .

$lim_{x \to 3} \frac{\frac{2 (x) + 2 \cdot - 1}{2 \sqrt{x^{2} - 2 x + 6}} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.1.3

Factor $2$ out of $2 (x) + 2 (- 1)$ .

$lim_{x \to 3} \frac{\frac{2 (x - 1)}{2 \sqrt{x^{2} - 2 x + 6}} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.1.4

Cancel the common factors.

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Step 1.6.1.4.1

Factor $2$ out of $2 \sqrt{x^{2} - 2 x + 6}$ .

$lim_{x \to 3} \frac{\frac{2 (x - 1)}{2 (\sqrt{x^{2} - 2 x + 6})} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.1.4.2

Cancel the common factor.

$lim_{x \to 3} \frac{\frac{2 (x - 1)}{2 \sqrt{x^{2} - 2 x + 6}} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.1.4.3

Rewrite the expression.

$lim_{x \to 3} \frac{\frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + \frac{- (2 x + 2)}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.2

Cancel the common factor of $2 x + 2$ and $2$ .

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Step 1.6.2.1

Factor $2$ out of $- (2 x + 2)$ .

$lim_{x \to 3} \frac{\frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + \frac{2 (- (x + 1))}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.2.2

Cancel the common factors.

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Step 1.6.2.2.1

Factor $2$ out of $2 \sqrt{x^{2} + 2 x - 6}$ .

$lim_{x \to 3} \frac{\frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + \frac{2 (- (x + 1))}{2 (\sqrt{x^{2} + 2 x - 6})}}{2 x - 4}$

Step 1.6.2.2.2

Cancel the common factor.

$lim_{x \to 3} \frac{\frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + \frac{2 (- (x + 1))}{2 \sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 1.6.2.2.3

Rewrite the expression.

$lim_{x \to 3} \frac{\frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{2 x - 4}$

Step 2

Evaluate the limit.

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Step 2.1

Split the limit using the Limits Quotient Rule on the limit as $x$ approaches $3$ .

$\frac{lim_{x \to 3} \frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.2

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{lim_{x \to 3} \frac{x - 1}{\sqrt{x^{2} - 2 x + 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.3

Split the limit using the Limits Quotient Rule on the limit as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1}{lim_{x \to 3} \sqrt{x^{2} - 2 x + 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.4

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - lim_{x \to 3} 1}{lim_{x \to 3} \sqrt{x^{2} - 2 x + 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.5

Evaluate the limit of $1$ which is constant as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{lim_{x \to 3} \sqrt{x^{2} - 2 x + 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.6

Move the limit under the radical sign.

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{lim_{x \to 3} x^{2} - 2 x + 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.7

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{lim_{x \to 3} x^{2} - lim_{x \to 3} 2 x + lim_{x \to 3} 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.8

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - lim_{x \to 3} 2 x + lim_{x \to 3} 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.9

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + lim_{x \to 3} 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.10

Evaluate the limit of $6$ which is constant as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + lim_{x \to 3} \frac{- (x + 1)}{\sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.11

Split the limit using the Limits Quotient Rule on the limit as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{lim_{x \to 3} - (x + 1)}{lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.12

Move the term $- 1$ outside of the limit because it is constant with respect to $x$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- lim_{x \to 3} x + 1}{lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.13

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + lim_{x \to 3} 1)}{lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.14

Evaluate the limit of $1$ which is constant as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{lim_{x \to 3} \sqrt{x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.15

Move the limit under the radical sign.

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{lim_{x \to 3} x^{2} + 2 x - 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.16

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{lim_{x \to 3} x^{2} + lim_{x \to 3} 2 x - lim_{x \to 3} 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.17

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + lim_{x \to 3} 2 x - lim_{x \to 3} 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.18

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - lim_{x \to 3} 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.19

Evaluate the limit of $6$ which is constant as $x$ approaches $3$ .

$\frac{\frac{lim_{x \to 3} x - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}}{lim_{x \to 3} 2 x - 4}$

Step 2.20

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $3$ .

Step 2.21

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

Step 2.22

Evaluate the limit of $4$ which is constant as $x$ approaches $3$ .

Step 3

Evaluate the limits by plugging in $3$ for all occurrences of $x$ .

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Step 3.1

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{{(lim_{x \to 3} x)}^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}}{2 lim_{x \to 3} x - 1 \cdot 4}$

Step 3.2

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 lim_{x \to 3} x + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}}{2 lim_{x \to 3} x - 1 \cdot 4}$

Step 3.3

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (lim_{x \to 3} x + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}}{2 lim_{x \to 3} x - 1 \cdot 4}$

Step 3.4

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{{(lim_{x \to 3} x)}^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}}{2 lim_{x \to 3} x - 1 \cdot 4}$

Step 3.5

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{3^{2} + 2 lim_{x \to 3} x - 1 \cdot 6}}}{2 lim_{x \to 3} x - 1 \cdot 4}$

Step 3.6

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{2 lim_{x \to 3} x - 1 \cdot 4}$

Step 3.7

Evaluate the limit of $x$ by plugging in $3$ for $x$ .

$\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{2 \cdot 3 - 1 \cdot 4}$

Step 4

Simplify the answer.

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Step 4.1

Multiply the numerator and denominator of the fraction by $\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}$ .

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Step 4.1.1

Multiply $\frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{2 \cdot 3 - 1 \cdot 4}$ by $\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}$ .

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}} \cdot \frac{\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{2 \cdot 3 - 1 \cdot 4}$

Step 4.1.2

Combine.

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (\frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}})}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3 - 1 \cdot 4)}$

Step 4.2

Apply the distributive property.

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3

Simplify by cancelling.

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Step 4.3.1

Cancel the common factor of $\sqrt{3^{2} - 2 \cdot 3 + 6}$ .

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Step 4.3.1.1

Factor $\sqrt{3^{2} - 2 \cdot 3 + 6}$ out of $\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}$ .

$\frac{\sqrt{3^{2} - 2 \cdot 3 + 6} (\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}) \frac{3 - 1 \cdot 1}{\sqrt{3^{2} - 2 \cdot 3 + 6}} + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.1.2

Cancel the common factor.

Step 4.3.1.3

Rewrite the expression.

$\frac{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (3 - 1 \cdot 1) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.2

Multiply $2$ by $3$ .

$\frac{\sqrt{3^{2} + 6 - 1 \cdot 6} (3 - 1 \cdot 1) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.3

Multiply $- 1$ by $6$ .

$\frac{\sqrt{3^{2} + 6 - 6} (3 - 1 \cdot 1) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.4

Multiply $- 1$ by $1$ .

$\frac{\sqrt{3^{2} + 6 - 6} (3 - 1) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.5

Cancel the common factor of $\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}$ .

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Step 4.3.5.1

Factor $\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}$ out of $\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}$ .

$\frac{\sqrt{3^{2} + 6 - 6} (3 - 1) + \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \sqrt{3^{2} - 2 \cdot 3 + 6} \frac{- (3 + 1)}{\sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6}}}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.5.2

Cancel the common factor.

Step 4.3.5.3

Rewrite the expression.

$\frac{\sqrt{3^{2} + 6 - 6} (3 - 1) + \sqrt{3^{2} - 2 \cdot 3 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.3.6

Multiply $- 2$ by $3$ .

$\frac{\sqrt{3^{2} + 6 - 6} (3 - 1) + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (2 \cdot 3) + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4

Simplify the numerator.

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Step 4.4.1

Raise $3$ to the power of $2$ .

$\frac{\sqrt{9 + 6 - 6} (3 - 1) + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.2

Add $9$ and $6$ .

$\frac{\sqrt{15 - 6} (3 - 1) + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.3

Subtract $6$ from $15$ .

$\frac{\sqrt{9} (3 - 1) + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.4

Rewrite $9$ as $3^{2}$ .

$\frac{\sqrt{3^{2}} (3 - 1) + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.5

Pull terms out from under the radical, assuming positive real numbers.

$\frac{3 (3 - 1) + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.6

Subtract $1$ from $3$ .

$\frac{3 \cdot 2 + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.7

Multiply $3$ by $2$ .

$\frac{6 + \sqrt{3^{2} - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.8

Raise $3$ to the power of $2$ .

$\frac{6 + \sqrt{9 - 6 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.9

Subtract $6$ from $9$ .

$\frac{6 + \sqrt{3 + 6} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.10

Add $3$ and $6$ .

$\frac{6 + \sqrt{9} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.11

Rewrite $9$ as $3^{2}$ .

$\frac{6 + \sqrt{3^{2}} (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.12

Pull terms out from under the radical, assuming positive real numbers.

$\frac{6 + 3 (- (3 + 1))}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.13

Add $3$ and $1$ .

$\frac{6 + 3 (- 1 \cdot 4)}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.14

Multiply $3 (- 1 \cdot 4)$ .

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Step 4.4.14.1

Multiply $- 1$ by $4$ .

$\frac{6 + 3 \cdot - 4}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.14.2

Multiply $3$ by $- 4$ .

$\frac{6 - 12}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.4.15

Subtract $12$ from $6$ .

$\frac{- 6}{\sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5

Simplify the denominator.

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Step 4.5.1

Combine using the product rule for radicals.

$\frac{- 6}{\sqrt{(3^{2} - 2 \cdot 3 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.2

Raise $3$ to the power of $2$ .

$\frac{- 6}{\sqrt{(9 - 2 \cdot 3 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.3

Multiply $- 2$ by $3$ .

$\frac{- 6}{\sqrt{(9 - 6 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.4

Subtract $6$ from $9$ .

$\frac{- 6}{\sqrt{(3 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.5

Add $3$ and $6$ .

$\frac{- 6}{\sqrt{9 (3^{2} + 2 \cdot 3 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.6

Raise $3$ to the power of $2$ .

$\frac{- 6}{\sqrt{9 (9 + 2 \cdot 3 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.7

Multiply $2$ by $3$ .

$\frac{- 6}{\sqrt{9 (9 + 6 - 1 \cdot 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.8

Multiply $- 1$ by $6$ .

$\frac{- 6}{\sqrt{9 (9 + 6 - 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.9

Add $9$ and $6$ .

$\frac{- 6}{\sqrt{9 (15 - 6)} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.10

Subtract $6$ from $15$ .

$\frac{- 6}{\sqrt{9 \cdot 9} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.11

Multiply $9$ by $9$ .

$\frac{- 6}{\sqrt{81} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.12

Rewrite $81$ as $9^{2}$ .

$\frac{- 6}{\sqrt{9^{2}} \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.13

Pull terms out from under the radical, assuming positive real numbers.

$\frac{- 6}{9 \cdot 2 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.14

Multiply $9 \cdot 2 \cdot 3$ .

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Step 4.5.14.1

Multiply $9$ by $2$ .

$\frac{- 6}{18 \cdot 3 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.14.2

Multiply $18$ by $3$ .

$\frac{- 6}{54 + \sqrt{3^{2} - 2 \cdot 3 + 6} \sqrt{3^{2} + 2 \cdot 3 - 1 \cdot 6} (- 1 \cdot 4)}$

Step 4.5.15

Combine using the product rule for radicals.

$\frac{- 6}{54 + \sqrt{(3^{2} - 2 \cdot 3 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.16

Raise $3$ to the power of $2$ .

$\frac{- 6}{54 + \sqrt{(9 - 2 \cdot 3 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.17

Multiply $- 2$ by $3$ .

$\frac{- 6}{54 + \sqrt{(9 - 6 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.18

Subtract $6$ from $9$ .

$\frac{- 6}{54 + \sqrt{(3 + 6) (3^{2} + 2 \cdot 3 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.19

Add $3$ and $6$ .

$\frac{- 6}{54 + \sqrt{9 (3^{2} + 2 \cdot 3 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.20

Raise $3$ to the power of $2$ .

$\frac{- 6}{54 + \sqrt{9 (9 + 2 \cdot 3 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.21

Multiply $2$ by $3$ .

$\frac{- 6}{54 + \sqrt{9 (9 + 6 - 1 \cdot 6)} (- 1 \cdot 4)}$

Step 4.5.22

Multiply $- 1$ by $6$ .

$\frac{- 6}{54 + \sqrt{9 (9 + 6 - 6)} (- 1 \cdot 4)}$

Step 4.5.23

Add $9$ and $6$ .

$\frac{- 6}{54 + \sqrt{9 (15 - 6)} (- 1 \cdot 4)}$

Step 4.5.24

Subtract $6$ from $15$ .

$\frac{- 6}{54 + \sqrt{9 \cdot 9} (- 1 \cdot 4)}$

Step 4.5.25

Multiply $9$ by $9$ .

$\frac{- 6}{54 + \sqrt{81} (- 1 \cdot 4)}$

Step 4.5.26

Rewrite $81$ as $9^{2}$ .

$\frac{- 6}{54 + \sqrt{9^{2}} (- 1 \cdot 4)}$

Step 4.5.27

Pull terms out from under the radical, assuming positive real numbers.

$\frac{- 6}{54 + 9 (- 1 \cdot 4)}$

Step 4.5.28

Multiply $9 (- 1 \cdot 4)$ .

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Step 4.5.28.1

Multiply $- 1$ by $4$ .

$\frac{- 6}{54 + 9 \cdot - 4}$

Step 4.5.28.2

Multiply $9$ by $- 4$ .

$\frac{- 6}{54 - 36}$

Step 4.5.29

Subtract $36$ from $54$ .

$\frac{- 6}{18}$

Step 4.6

Cancel the common factor of $- 6$ and $18$ .

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Step 4.6.1

Factor $6$ out of $- 6$ .

$\frac{6 (- 1)}{18}$

Step 4.6.2

Cancel the common factors.

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Step 4.6.2.1

Factor $6$ out of $18$ .

$\frac{6 \cdot - 1}{6 \cdot 3}$

Step 4.6.2.2

Cancel the common factor.

$\frac{6 \cdot - 1}{6 \cdot 3}$

Step 4.6.2.3

Rewrite the expression.

$\frac{- 1}{3}$

Step 4.7

Move the negative in front of the fraction.

$- \frac{1}{3}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$- \frac{1}{3}$

Decimal Form:

$- 0.\overline{3}$