Calculus Examples

$\frac{x + 6}{\sqrt{x^{2} + 6}}$

Step 1

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

$\frac{d}{d x} [\frac{x + 6}{{(x^{2} + 6)}^{\frac{1}{2}}}]$

Step 2

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

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

Step 3

Multiply the exponents in ${({(x^{2} + 6)}^{\frac{1}{2}})}^{2}$ .

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Step 3.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

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

Step 3.2

Cancel the common factor of $2$ .

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Step 3.2.1

Cancel the common factor.

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

Step 3.2.2

Rewrite the expression.

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

Step 4

Simplify.

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

Step 5

Differentiate.

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Step 5.1

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

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

Step 5.2

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

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

Step 5.3

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

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

Step 5.4

Simplify the expression.

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Step 5.4.1

Add $1$ and $0$ .

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

Step 5.4.2

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

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

Step 6

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 $g (x) = x^{2} + 6$ .

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Step 6.1

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

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

Step 6.2

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

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

Step 6.3

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

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

Step 7

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

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

Step 8

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

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

Step 9

Combine the numerators over the common denominator.

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

Step 10

Simplify the numerator.

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Step 10.1

Multiply $- 1$ by $2$ .

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

Step 10.2

Subtract $2$ from $1$ .

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

Step 11

Combine fractions.

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Step 11.1

Move the negative in front of the fraction.

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

Step 11.2

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

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

Step 11.3

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

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

Step 12

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

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

Step 13

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

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

Step 14

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

$\frac{{(x^{2} + 6)}^{\frac{1}{2}} - (x + 6) (\frac{1}{2 {(x^{2} + 6)}^{\frac{1}{2}}} (2 x + 0))}{x^{2} + 6}$

Step 15

Simplify terms.

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Step 15.1

Add $2 x$ and $0$ .

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

Step 15.2

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

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

Step 15.3

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

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

Step 15.4

Cancel the common factor.

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

Step 15.5

Rewrite the expression.

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

Step 16

Simplify.

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Step 16.1

Apply the distributive property.

$\frac{{(x^{2} + 6)}^{\frac{1}{2}} + (- x - 1 \cdot 6) \frac{x}{{(x^{2} + 6)}^{\frac{1}{2}}}}{x^{2} + 6}$

Step 16.2

Simplify the numerator.

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Step 16.2.1

Let $u_{2} = {(x^{2} + 6)}^{\frac{1}{2}}$ . Substitute $u_{2}$ for all occurrences of ${(x^{2} + 6)}^{\frac{1}{2}}$ .

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Step 16.2.1.1

Multiply $u_{2}$ by $u_{2}$ .

$\frac{\frac{{u_{2}}^{2} + (- x - 6) x}{u_{2}}}{x^{2} + 6}$

Step 16.2.1.2

Apply the distributive property.

$\frac{\frac{{u_{2}}^{2} - x \cdot x - 6 x}{u_{2}}}{x^{2} + 6}$

Step 16.2.1.3

Multiply $x$ by $x$ by adding the exponents.

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Step 16.2.1.3.1

Move $x$ .

$\frac{\frac{{u_{2}}^{2} - (x \cdot x) - 6 x}{u_{2}}}{x^{2} + 6}$

Step 16.2.1.3.2

Multiply $x$ by $x$ .

$\frac{\frac{{u_{2}}^{2} - x^{2} - 6 x}{u_{2}}}{x^{2} + 6}$

Step 16.2.2

Replace all occurrences of $u_{2}$ with ${(x^{2} + 6)}^{\frac{1}{2}}$ .

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

Step 16.2.3

Simplify.

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Step 16.2.3.1

Simplify each term.

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Step 16.2.3.1.1

Multiply the exponents in ${({(x^{2} + 6)}^{\frac{1}{2}})}^{2}$ .

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Step 16.2.3.1.1.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{{(x^{2} + 6)}^{\frac{1}{2} \cdot 2} - x^{2} - 6 x}{{(x^{2} + 6)}^{\frac{1}{2}}}}{x^{2} + 6}$

Step 16.2.3.1.1.2

Cancel the common factor of $2$ .

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Step 16.2.3.1.1.2.1

Cancel the common factor.

$\frac{\frac{{(x^{2} + 6)}^{\frac{1}{2} \cdot 2} - x^{2} - 6 x}{{(x^{2} + 6)}^{\frac{1}{2}}}}{x^{2} + 6}$

Step 16.2.3.1.1.2.2

Rewrite the expression.

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

Step 16.2.3.1.2

Simplify.

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

Step 16.2.3.2

Combine the opposite terms in $x^{2} + 6 - x^{2} - 6 x$ .

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Step 16.2.3.2.1

Subtract $x^{2}$ from $x^{2}$ .

$\frac{\frac{0 + 6 - 6 x}{{(x^{2} + 6)}^{\frac{1}{2}}}}{x^{2} + 6}$

Step 16.2.3.2.2

Add $0$ and $6$ .

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

Step 16.2.4

Factor $6$ out of $6 - 6 x$ .

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Step 16.2.4.1

Factor $6$ out of $6$ .

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

Step 16.2.4.2

Factor $6$ out of $- 6 x$ .

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

Step 16.2.4.3

Factor $6$ out of $6 (1) + 6 (- x)$ .

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

Step 16.3

Combine terms.

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Step 16.3.1

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

$\frac{6 (1 - x)}{{(x^{2} + 6)}^{\frac{1}{2}}} \cdot \frac{1}{x^{2} + 6}$

Step 16.3.2

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

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

Step 16.3.3

Multiply ${(x^{2} + 6)}^{\frac{1}{2}}$ by $x^{2} + 6$ by adding the exponents.

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Step 16.3.3.1

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

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Step 16.3.3.1.1

Raise $x^{2} + 6$ to the power of $1$ .

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

Step 16.3.3.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

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

Step 16.3.3.2

Write $1$ as a fraction with a common denominator.

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

Step 16.3.3.3

Combine the numerators over the common denominator.

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

Step 16.3.3.4

Add $1$ and $2$ .

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