Calculus Examples

$lim_{x \to \infty} \frac{3 x^{7} - 4 x^{2} + 1}{5 - 10 x^{2}}$

Step 1

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

$lim_{x \to \infty} \frac{\frac{3 x^{7}}{x^{2}} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

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 $x^{7}$ and $x^{2}$ .

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Step 2.1.1.1

Factor $x^{2}$ out of $3 x^{7}$ .

$lim_{x \to \infty} \frac{\frac{x^{2} (3 x^{5})}{x^{2}} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.1.1.2

Cancel the common factors.

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Step 2.1.1.2.1

Multiply by $1$ .

$lim_{x \to \infty} \frac{\frac{x^{2} (3 x^{5})}{x^{2} \cdot 1} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.1.1.2.2

Cancel the common factor.

$lim_{x \to \infty} \frac{\frac{x^{2} (3 x^{5})}{x^{2} \cdot 1} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.1.1.2.3

Rewrite the expression.

$lim_{x \to \infty} \frac{\frac{3 x^{5}}{1} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.1.1.2.4

Divide $3 x^{5}$ by $1$ .

$lim_{x \to \infty} \frac{3 x^{5} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.1.2

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

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Step 2.1.2.1

Cancel the common factor.

$lim_{x \to \infty} \frac{3 x^{5} + \frac{- 4 x^{2}}{x^{2}} + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.1.2.2

Divide $- 4$ by $1$ .

$lim_{x \to \infty} \frac{3 x^{5} - 4 + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.2

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

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Step 2.2.1

Cancel the common factor.

$lim_{x \to \infty} \frac{3 x^{5} - 4 + \frac{1}{x^{2}}}{\frac{5}{x^{2}} + \frac{- 10 x^{2}}{x^{2}}}$

Step 2.2.2

Divide $- 10$ by $1$ .

$lim_{x \to \infty} \frac{3 x^{5} - 4 + \frac{1}{x^{2}}}{\frac{5}{x^{2}} - 10}$

Step 3

As $x$ approaches $\infty$ , the fraction $\frac{1}{x^{2}}$ approaches $0$ .

$lim_{x \to \infty} \frac{3 x^{5} - 4 + 0}{\frac{5}{x^{2}} - 10}$

Step 4

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

$lim_{x \to \infty} \frac{3 x^{5} - 4 + 0}{0 - 10}$

Step 5

Since its numerator is unbounded while its denominator approaches a constant number, the fraction $\frac{3 x^{5} - 4 + 0}{0 - 10}$ approaches negative infinity.

$- \infty$