Calculus Examples

$lim_{x \to \infty} \frac{{(2 x + 1)}^{40} {(4 x - 1)}^{5}}{{(2 x + 3)}^{45}}$

Step 1

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

$lim_{x \to \infty} \frac{{(\frac{2 x}{x} + \frac{1}{x})}^{40} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{{(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2

Evaluate the limit.

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Step 2.1

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

$\frac{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{1}{x})}^{40} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2.2

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

$\frac{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{1}{x})}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2.3

Move the exponent $40$ from ${(\frac{2 x}{x} + \frac{1}{x})}^{40}$ outside the limit using the Limits Power Rule.

$\frac{{(lim_{x \to \infty} \frac{2 x}{x} + \frac{1}{x})}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2.4

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

$\frac{{(lim_{x \to \infty} \frac{2 x}{x} + lim_{x \to \infty} \frac{1}{x})}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2.5

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{{(2 lim_{x \to \infty} \frac{x}{x} + lim_{x \to \infty} \frac{1}{x})}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2.6

Cancel the common factor of $x$ .

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Step 2.6.1

Cancel the common factor.

Step 2.6.2

Rewrite the expression.

$\frac{{(2 lim_{x \to \infty} 1 + lim_{x \to \infty} \frac{1}{x})}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 2.7

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

$\frac{{(2 \cdot 1 + lim_{x \to \infty} \frac{1}{x})}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 3

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot lim_{x \to \infty} {(\frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 4

Evaluate the limit.

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Step 4.1

Move the exponent $5$ from ${(\frac{4 x}{x} - \frac{1}{x})}^{5}$ outside the limit using the Limits Power Rule.

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(lim_{x \to \infty} \frac{4 x}{x} - \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 4.2

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(lim_{x \to \infty} \frac{4 x}{x} - lim_{x \to \infty} \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 4.3

Move the term $4$ outside of the limit because it is constant with respect to $x$ .

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 lim_{x \to \infty} \frac{x}{x} - lim_{x \to \infty} \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 4.4

Cancel the common factor of $x$ .

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Step 4.4.1

Cancel the common factor.

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 lim_{x \to \infty} \frac{x}{x} - lim_{x \to \infty} \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 4.4.2

Rewrite the expression.

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 lim_{x \to \infty} 1 - lim_{x \to \infty} \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 4.5

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - lim_{x \to \infty} \frac{1}{x})}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 5

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{lim_{x \to \infty} {(\frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 6

Evaluate the limit.

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Step 6.1

Move the exponent $45$ from ${(\frac{2 x}{x} + \frac{3}{x})}^{45}$ outside the limit using the Limits Power Rule.

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(lim_{x \to \infty} \frac{2 x}{x} + \frac{3}{x})}^{45}}$

Step 6.2

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(lim_{x \to \infty} \frac{2 x}{x} + lim_{x \to \infty} \frac{3}{x})}^{45}}$

Step 6.3

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(2 lim_{x \to \infty} \frac{x}{x} + lim_{x \to \infty} \frac{3}{x})}^{45}}$

Step 6.4

Cancel the common factor of $x$ .

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Step 6.4.1

Cancel the common factor.

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(2 lim_{x \to \infty} \frac{x}{x} + lim_{x \to \infty} \frac{3}{x})}^{45}}$

Step 6.4.2

Rewrite the expression.

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(2 lim_{x \to \infty} 1 + lim_{x \to \infty} \frac{3}{x})}^{45}}$

Step 6.5

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(2 \cdot 1 + lim_{x \to \infty} \frac{3}{x})}^{45}}$

Step 6.6

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(2 \cdot 1 + 3 lim_{x \to \infty} \frac{1}{x})}^{45}}$

Step 7

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

$\frac{{(2 \cdot 1 + 0)}^{40} \cdot {(4 \cdot 1 - 0)}^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8

Simplify the answer.

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Step 8.1

Simplify the numerator.

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Step 8.1.1

Multiply $2$ by $1$ .

$\frac{{(2 + 0)}^{40} {(4 \cdot 1 - 0)}^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.1.2

Add $2$ and $0$ .

$\frac{2^{40} {(4 \cdot 1 - 0)}^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.1.3

Multiply $4$ by $1$ .

$\frac{2^{40} {(4 - 0)}^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.1.4

Multiply $- 1$ by $0$ .

$\frac{2^{40} {(4 + 0)}^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.1.5

Add $4$ and $0$ .

$\frac{2^{40} \cdot 4^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.1.6

Raise $2$ to the power of $40$ .

$\frac{1099511627776 \cdot 4^{5}}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.1.7

Raise $4$ to the power of $5$ .

$\frac{1099511627776 \cdot 1024}{{(2 \cdot 1 + 3 \cdot 0)}^{45}}$

Step 8.2

Simplify the denominator.

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Step 8.2.1

Multiply $2$ by $1$ .

$\frac{1099511627776 \cdot 1024}{{(2 + 3 \cdot 0)}^{45}}$

Step 8.2.2

Multiply $3$ by $0$ .

$\frac{1099511627776 \cdot 1024}{{(2 + 0)}^{45}}$

Step 8.2.3

Add $2$ and $0$ .

$\frac{1099511627776 \cdot 1024}{2^{45}}$

Step 8.2.4

Raise $2$ to the power of $45$ .

$\frac{1099511627776 \cdot 1024}{35184372088832}$

Step 8.3

Multiply $1099511627776$ by $1024$ .

$\frac{1125899906842624}{35184372088832}$

Step 8.4

Divide $1125899906842624$ by $35184372088832$ .

$32$