Calculus Examples

$lim_{x \to \infty} \frac{\sqrt{49 x^{2} - 4} + 3}{x + 3}$

Step 1

Simplify each term.

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Step 1.1

Rewrite $49 x^{2}$ as ${(7 x)}^{2}$ .

$lim_{x \to \infty} \frac{\sqrt{{(7 x)}^{2} - 4} + 3}{x + 3}$

Step 1.2

Rewrite $4$ as $2^{2}$ .

$lim_{x \to \infty} \frac{\sqrt{{(7 x)}^{2} - 2^{2}} + 3}{x + 3}$

Step 1.3

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 7 x$ and $b = 2$ .

$lim_{x \to \infty} \frac{\sqrt{(7 x + 2) (7 x - 2)} + 3}{x + 3}$

Step 2

Divide the numerator and denominator by the highest power of $x$ in the denominator, which is $\sqrt{x^{2}} = x$ .

$lim_{x \to \infty} \frac{\sqrt{\frac{(7 x + 2) (7 x - 2)}{x^{2}}} + \frac{3}{x}}{\frac{x}{x} + \frac{3}{x}}$

Step 3

Evaluate the limit.

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Step 3.1

Cancel the common factor of $x$ .

$lim_{x \to \infty} \frac{\sqrt{\frac{(7 x + 2) (7 x - 2)}{x^{2}}} + \frac{3}{x}}{1 + \frac{3}{x}}$

Step 3.2

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

$\frac{lim_{x \to \infty} \sqrt{\frac{(7 x + 2) (7 x - 2)}{x^{2}}} + \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 3.3

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

$\frac{lim_{x \to \infty} \sqrt{\frac{(7 x + 2) (7 x - 2)}{x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 3.4

Move the limit under the radical sign.

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) (7 x - 2)}{x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4

Apply L'Hospital's rule.

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Step 4.1

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

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Step 4.1.1

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

$\frac{\sqrt{\frac{lim_{x \to \infty} (7 x + 2) (7 x - 2)}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2

Evaluate the limit of the numerator.

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Step 4.1.2.1

Apply the distributive property.

$\frac{\sqrt{\frac{lim_{x \to \infty} 7 x (7 x - 2) + 2 (7 x - 2)}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.2

Apply the distributive property.

$\frac{\sqrt{\frac{lim_{x \to \infty} 7 x \cdot 7 x + 7 x \cdot - 2 + 2 (7 x - 2)}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.3

Apply the distributive property.

$\frac{\sqrt{\frac{lim_{x \to \infty} 7 x \cdot 7 x + 7 x \cdot - 2 + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.4

Simplify the expression.

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Step 4.1.2.4.1

Move $x$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 7 \cdot 7 x \cdot x + 7 x \cdot - 2 + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.4.2

Move $x$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 7 \cdot 7 x \cdot x + 7 \cdot - 2 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.4.3

Multiply $7$ by $7$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x \cdot x + 7 \cdot - 2 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.5

Raise $x$ to the power of $1$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{1} x + 7 \cdot - 2 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.6

Raise $x$ to the power of $1$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{1} x^{1} + 7 \cdot - 2 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.7

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

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{1 + 1} + 7 \cdot - 2 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.8

Simplify by adding terms.

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Step 4.1.2.8.1

Add $1$ and $1$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{2} + 7 \cdot - 2 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.8.2

Multiply.

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Step 4.1.2.8.2.1

Multiply $7$ by $- 2$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{2} - 14 x + 2 \cdot 7 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.8.2.2

Multiply $2$ by $7$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{2} - 14 x + 14 x + 2 \cdot - 2}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.8.2.3

Multiply $2$ by $- 2$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{2} - 14 x + 14 x - 4}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.8.3

Add $- 14 x$ and $14 x$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{2} + 0 - 4}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.8.4

Subtract $4$ from $0$ .

$\frac{\sqrt{\frac{lim_{x \to \infty} 49 x^{2} - 4}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.2.9

The limit at infinity of a polynomial whose leading coefficient is positive is infinity.

$\frac{\sqrt{\frac{\infty}{lim_{x \to \infty} x^{2}}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.3

The limit at infinity of a polynomial whose leading coefficient is positive is infinity.

$\frac{\sqrt{\frac{\infty}{\infty}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.1.4

Infinity divided by infinity is undefined.

Undefined

$\frac{\sqrt{\frac{\infty}{\infty}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.2

Since $\frac{\infty}{\infty}$ 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.

$lim_{x \to \infty} \frac{(7 x + 2) (7 x - 2)}{x^{2}} = lim_{x \to \infty} \frac{\frac{d}{d x} [(7 x + 2) (7 x - 2)]}{\frac{d}{d x} [x^{2}]}$

Step 4.3

Find the derivative of the numerator and denominator.

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Step 4.3.1

Differentiate the numerator and denominator.

$\frac{\sqrt{lim_{x \to \infty} \frac{\frac{d}{d x} [(7 x + 2) (7 x - 2)]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.2

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = 7 x + 2$ and $g (x) = 7 x - 2$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) \frac{d}{d x} [7 x - 2] + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.3

By the Sum Rule, the derivative of $7 x - 2$ with respect to $x$ is $\frac{d}{d x} [7 x] + \frac{d}{d x} [- 2]$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) (\frac{d}{d x} [7 x] + \frac{d}{d x} [- 2]) + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.4

Since $7$ is constant with respect to $x$ , the derivative of $7 x$ with respect to $x$ is $7 \frac{d}{d x} [x]$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) (7 \frac{d}{d x} [x] + \frac{d}{d x} [- 2]) + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.5

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

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) (7 \cdot 1 + \frac{d}{d x} [- 2]) + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.6

Multiply $7$ by $1$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) (7 + \frac{d}{d x} [- 2]) + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.7

Since $- 2$ is constant with respect to $x$ , the derivative of $- 2$ with respect to $x$ is $0$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) (7 + 0) + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.8

Add $7$ and $0$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{(7 x + 2) \cdot 7 + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.9

Move $7$ to the left of $7 x + 2$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 \cdot (7 x + 2) + (7 x - 2) \frac{d}{d x} [7 x + 2]}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.10

By the Sum Rule, the derivative of $7 x + 2$ with respect to $x$ is $\frac{d}{d x} [7 x] + \frac{d}{d x} [2]$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + (7 x - 2) (\frac{d}{d x} [7 x] + \frac{d}{d x} [2])}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.11

Since $7$ is constant with respect to $x$ , the derivative of $7 x$ with respect to $x$ is $7 \frac{d}{d x} [x]$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + (7 x - 2) (7 \frac{d}{d x} [x] + \frac{d}{d x} [2])}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.12

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

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + (7 x - 2) (7 \cdot 1 + \frac{d}{d x} [2])}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.13

Multiply $7$ by $1$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + (7 x - 2) (7 + \frac{d}{d x} [2])}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.14

Since $2$ is constant with respect to $x$ , the derivative of $2$ with respect to $x$ is $0$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + (7 x - 2) (7 + 0)}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.15

Add $7$ and $0$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + (7 x - 2) \cdot 7}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.16

Move $7$ to the left of $7 x - 2$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{7 (7 x + 2) + 7 \cdot (7 x - 2)}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17

Simplify.

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Step 4.3.17.1

Apply the distributive property.

$\frac{\sqrt{lim_{x \to \infty} \frac{7 \cdot 7 x + 7 \cdot 2 + 7 (7 x - 2)}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.2

Apply the distributive property.

$\frac{\sqrt{lim_{x \to \infty} \frac{7 \cdot 7 x + 7 \cdot 2 + 7 \cdot 7 x + 7 \cdot - 2}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3

Combine terms.

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Step 4.3.17.3.1

Multiply $7$ by $7$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{49 x + 7 \cdot 2 + 7 \cdot 7 x + 7 \cdot - 2}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3.2

Multiply $7$ by $2$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{49 x + 14 + 7 \cdot 7 x + 7 \cdot - 2}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3.3

Multiply $7$ by $7$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{49 x + 14 + 49 x + 7 \cdot - 2}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3.4

Multiply $7$ by $- 2$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{49 x + 14 + 49 x - 14}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3.5

Add $49 x$ and $49 x$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{98 x + 14 - 14}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3.6

Subtract $14$ from $14$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{98 x + 0}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.17.3.7

Add $98 x$ and $0$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{98 x}{\frac{d}{d x} [x^{2}]}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.3.18

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

$\frac{\sqrt{lim_{x \to \infty} \frac{98 x}{2 x}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.4

Reduce.

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Step 4.4.1

Cancel the common factor of $98$ and $2$ .

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Step 4.4.1.1

Factor $2$ out of $98 x$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{2 \cdot 49 x}{2 x}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.4.1.2

Cancel the common factors.

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Step 4.4.1.2.1

Factor $2$ out of $2 x$ .

$\frac{\sqrt{lim_{x \to \infty} \frac{2 \cdot 49 x}{2 (x)}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.4.1.2.2

Cancel the common factor.

$\frac{\sqrt{lim_{x \to \infty} \frac{2 \cdot 49 x}{2 x}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.4.1.2.3

Rewrite the expression.

$\frac{\sqrt{lim_{x \to \infty} \frac{49 x}{x}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.4.2

Cancel the common factor of $x$ .

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Step 4.4.2.1

Cancel the common factor.

$\frac{\sqrt{lim_{x \to \infty} \frac{49 x}{x}} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 4.4.2.2

Divide $49$ by $1$ .

$\frac{\sqrt{lim_{x \to \infty} 49} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 5

Evaluate the limit.

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Step 5.1

Evaluate the limit of $49$ which is constant as $x$ approaches $\infty$ .

$\frac{\sqrt{49} + lim_{x \to \infty} \frac{3}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 5.2

Move the term $3$ outside of the limit because it is constant with respect to $x$ .

$\frac{\sqrt{49} + 3 lim_{x \to \infty} \frac{1}{x}}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 6

Since its numerator approaches a real number while its denominator is unbounded, the fraction $\frac{1}{x}$ approaches $0$ .

$\frac{\sqrt{49} + 3 \cdot 0}{lim_{x \to \infty} 1 + \frac{3}{x}}$

Step 7

Evaluate the limit.

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Step 7.1

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

$\frac{\sqrt{49} + 3 \cdot 0}{lim_{x \to \infty} 1 + lim_{x \to \infty} \frac{3}{x}}$

Step 7.2

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

$\frac{\sqrt{49} + 3 \cdot 0}{1 + lim_{x \to \infty} \frac{3}{x}}$

Step 7.3

Move the term $3$ outside of the limit because it is constant with respect to $x$ .

$\frac{\sqrt{49} + 3 \cdot 0}{1 + 3 lim_{x \to \infty} \frac{1}{x}}$

Step 8

Since its numerator approaches a real number while its denominator is unbounded, the fraction $\frac{1}{x}$ approaches $0$ .

$\frac{\sqrt{49} + 3 \cdot 0}{1 + 3 \cdot 0}$

Step 9

Simplify the answer.

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Step 9.1

Simplify the numerator.

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Step 9.1.1

Rewrite $49$ as $7^{2}$ .

$\frac{\sqrt{7^{2}} + 3 \cdot 0}{1 + 3 \cdot 0}$

Step 9.1.2

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

$\frac{7 + 3 \cdot 0}{1 + 3 \cdot 0}$

Step 9.1.3

Multiply $3$ by $0$ .

$\frac{7 + 0}{1 + 3 \cdot 0}$

Step 9.1.4

Add $7$ and $0$ .

$\frac{7}{1 + 3 \cdot 0}$

Step 9.2

Simplify the denominator.

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Step 9.2.1

Multiply $3$ by $0$ .

$\frac{7}{1 + 0}$

Step 9.2.2

Add $1$ and $0$ .

$\frac{7}{1}$

Step 9.3

Divide $7$ by $1$ .

$7$