Calculus Examples

$lim_{x \to \infty} \frac{{(2 x^{3} - 4)}^{2} {(3 x + 7)}^{3}}{{(3 x^{2} - 2)}^{4} (4 x + 13)}$

Step 1

Simplify.

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Step 1.1

Apply the distributive property.

$lim_{x \to \infty} \frac{{(2 x^{3} - 4)}^{2} {(3 x + 7)}^{3}}{{(3 x^{2} - 2)}^{4} (4 x) + {(3 x^{2} - 2)}^{4} \cdot 13}$

Step 1.2

Move $13$ to the left of ${(3 x^{2} - 2)}^{4}$ .

$lim_{x \to \infty} \frac{{(2 x^{3} - 4)}^{2} {(3 x + 7)}^{3}}{{(3 x^{2} - 2)}^{4} \cdot 4 x + 13 \cdot {(3 x^{2} - 2)}^{4}}$

Step 1.3

Move $4$ to the left of ${(3 x^{2} - 2)}^{4}$ .

$lim_{x \to \infty} \frac{{(2 x^{3} - 4)}^{2} {(3 x + 7)}^{3}}{4 {(3 x^{2} - 2)}^{4} x + 13 {(3 x^{2} - 2)}^{4}}$

Step 1.4

Reorder factors in $4 {(3 x^{2} - 2)}^{4} x + 13 {(3 x^{2} - 2)}^{4}$ .

$lim_{x \to \infty} \frac{{(2 x^{3} - 4)}^{2} {(3 x + 7)}^{3}}{4 x {(3 x^{2} - 2)}^{4} + 13 {(3 x^{2} - 2)}^{4}}$

Step 2

Divide the numerator and denominator by the highest power of $x$ in the denominator.

$lim_{x \to \infty} \frac{{(\frac{2 x^{3}}{x^{3}} + \frac{- 4}{x^{3}})}^{2} {(\frac{3 x}{x} + \frac{7}{x})}^{3}}{4 x {(\frac{3 x^{2}}{x^{2}} + \frac{- 2}{x^{2}})}^{4} + 13 {(\frac{3 x^{2}}{x^{2}} + \frac{- 2}{x^{2}})}^{4}}$

Step 3

Since its numerator approaches a real number while its denominator is unbounded, the fraction $\frac{{(\frac{2 x^{3}}{x^{3}} + \frac{- 4}{x^{3}})}^{2} {(\frac{3 x}{x} + \frac{7}{x})}^{3}}{4 x {(\frac{3 x^{2}}{x^{2}} + \frac{- 2}{x^{2}})}^{4} + 13 {(\frac{3 x^{2}}{x^{2}} + \frac{- 2}{x^{2}})}^{4}}$ approaches $0$ .

$0$