Calculus Examples

$lim_{x \to \infty} \frac{(k^{2} + 2) x^{3} + k^{2} x - 2 k \sqrt{2} x^{3} + 2}{x^{2} - 5}$

Step 1

Apply the distributive property.

$lim_{x \to \infty} \frac{k^{2} x^{3} + 2 x^{3} + k^{2} x - 2 k \sqrt{2} x^{3} + 2}{x^{2} - 5}$

Step 2

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

$lim_{x \to \infty} \frac{\frac{k^{2} x^{3}}{x^{2}} + \frac{2 x^{3}}{x^{2}} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3

Simplify terms.

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Step 3.1

Simplify each term.

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Step 3.1.1

Cancel the common factor of $x^{3}$ and $x^{2}$ .

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Step 3.1.1.1

Factor $x^{2}$ out of $k^{2} x^{3}$ .

$lim_{x \to \infty} \frac{\frac{x^{2} (k^{2} x)}{x^{2}} + \frac{2 x^{3}}{x^{2}} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.1.2

Cancel the common factors.

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Step 3.1.1.2.1

Multiply by $1$ .

$lim_{x \to \infty} \frac{\frac{x^{2} (k^{2} x)}{x^{2} \cdot 1} + \frac{2 x^{3}}{x^{2}} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.1.2.2

Cancel the common factor.

Step 3.1.1.2.3

Rewrite the expression.

$lim_{x \to \infty} \frac{\frac{k^{2} x}{1} + \frac{2 x^{3}}{x^{2}} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.1.2.4

Divide $k^{2} x$ by $1$ .

$lim_{x \to \infty} \frac{k^{2} x + \frac{2 x^{3}}{x^{2}} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.2

Cancel the common factor of $x^{3}$ and $x^{2}$ .

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Step 3.1.2.1

Factor $x^{2}$ out of $2 x^{3}$ .

$lim_{x \to \infty} \frac{k^{2} x + \frac{x^{2} (2 x)}{x^{2}} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.2.2

Cancel the common factors.

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Step 3.1.2.2.1

Multiply by $1$ .

$lim_{x \to \infty} \frac{k^{2} x + \frac{x^{2} (2 x)}{x^{2} \cdot 1} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.2.2.2

Cancel the common factor.

$lim_{x \to \infty} \frac{k^{2} x + \frac{x^{2} (2 x)}{x^{2} \cdot 1} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.2.2.3

Rewrite the expression.

$lim_{x \to \infty} \frac{k^{2} x + \frac{2 x}{1} + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.2.2.4

Divide $2 x$ by $1$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2} x}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.3

Cancel the common factor of $x$ and $x^{2}$ .

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Step 3.1.3.1

Factor $x$ out of $k^{2} x$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{x k^{2}}{x^{2}} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.3.2

Cancel the common factors.

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Step 3.1.3.2.1

Factor $x$ out of $x^{2}$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{x k^{2}}{x \cdot x} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.3.2.2

Cancel the common factor.

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{x k^{2}}{x \cdot x} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.3.2.3

Rewrite the expression.

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} + \frac{- 2 k \sqrt{2} x^{3}}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.4

Cancel the common factor of $x^{3}$ and $x^{2}$ .

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Step 3.1.4.1

Factor $x^{2}$ out of $- 2 k \sqrt{2} x^{3}$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} + \frac{x^{2} (- 2 k \sqrt{2} x)}{x^{2}} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.4.2

Cancel the common factors.

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Step 3.1.4.2.1

Multiply by $1$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} + \frac{x^{2} (- 2 k \sqrt{2} x)}{x^{2} \cdot 1} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.4.2.2

Cancel the common factor.

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} + \frac{x^{2} (- 2 k \sqrt{2} x)}{x^{2} \cdot 1} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.4.2.3

Rewrite the expression.

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} + \frac{- 2 k \sqrt{2} x}{1} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.1.4.2.4

Divide $- 2 k \sqrt{2} x$ by $1$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} - 2 k \sqrt{2} x + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.2

Reorder factors in $k^{2} x + 2 x + \frac{k^{2}}{x} - 2 k \sqrt{2} x + \frac{2}{x^{2}}$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} - 2 k x \sqrt{2} + \frac{2}{x^{2}}}{\frac{x^{2}}{x^{2}} + \frac{- 5}{x^{2}}}$

Step 3.3

Simplify each term.

$lim_{x \to \infty} \frac{k^{2} x + 2 x + \frac{k^{2}}{x} - 2 k x \sqrt{2} + \frac{2}{x^{2}}}{1 - \frac{5}{x^{2}}}$

Step 4

As $x$ approaches $\infty$ , the fraction $\frac{k^{2}}{x}$ approaches $0$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + 0 - 2 k x \sqrt{2} + \frac{2}{x^{2}}}{1 - \frac{5}{x^{2}}}$

Step 5

As $x$ approaches $\infty$ , the fraction $\frac{2}{x^{2}}$ approaches $0$ .

$lim_{x \to \infty} \frac{k^{2} x + 2 x + 0 - 2 k x \sqrt{2} + 0}{1 - \frac{5}{x^{2}}}$

Step 6

As $x$ approaches $\infty$ , the fraction $\frac{5}{x^{2}}$ approaches $0$ .

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

Step 7

Since its numerator is unbounded while its denominator approaches a constant number, the fraction $\frac{k^{2} x + 2 x + 0 - 2 k x \sqrt{2} + 0}{1 - 0}$ approaches infinity.

$\infty$