Calculus Examples

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

Step 1

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

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

Step 2

Simplify terms.

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Step 2.1

Simplify each term.

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Step 2.1.1

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

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Step 2.1.1.1

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

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

Step 2.1.1.2

Cancel the common factors.

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Step 2.1.1.2.1

Multiply by $1$ .

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

Step 2.1.1.2.2

Cancel the common factor.

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

Step 2.1.1.2.3

Rewrite the expression.

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

Step 2.1.1.2.4

Divide $x$ by $1$ .

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

Step 2.1.2

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

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Step 2.1.2.1

Factor $x$ out of $- 2 x$ .

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

Step 2.1.2.2

Cancel the common factors.

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Step 2.1.2.2.1

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

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

Step 2.1.2.2.2

Cancel the common factor.

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

Step 2.1.2.2.3

Rewrite the expression.

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

Step 2.1.3

Move the negative in front of the fraction.

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

Step 2.2

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

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Step 2.2.1

Cancel the common factor.

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

Step 2.2.2

Divide $- 2$ by $1$ .

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

Step 3

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

$lim_{x \to \infty} \frac{x - 0 + \frac{3}{x^{2}}}{\frac{5}{x^{2}} - 2}$

Step 4

As $x$ approaches $\infty$ , the fraction $\frac{3}{x^{2}}$ approaches $0$ .

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

Step 5

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

$lim_{x \to \infty} \frac{x - 0 + 0}{0 - 2}$

Step 6

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

$- \infty$