Calculus Examples

$lim_{x \to 8} \frac{3 (x^{7} - 11) (x^{2} + 5)}{3 (x^{n} - 8) (x^{3} + 18)}$

Step 1

Cancel the common factor of $3$ .

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Step 1.1

Cancel the common factor.

$lim_{x \to 8} \frac{3 (x^{7} - 11) (x^{2} + 5)}{3 (x^{n} - 8) (x^{3} + 18)}$

Step 1.2

Rewrite the expression.

$lim_{x \to 8} \frac{(x^{7} - 11) (x^{2} + 5)}{(x^{n} - 8) (x^{3} + 18)}$

Step 2

Split the limit using the Limits Quotient Rule on the limit as $x$ approaches $8$ .

$\frac{lim_{x \to 8} (x^{7} - 11) (x^{2} + 5)}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 3

Split the limit using the Product of Limits Rule on the limit as $x$ approaches $8$ .

$\frac{lim_{x \to 8} x^{7} - 11 \cdot lim_{x \to 8} x^{2} + 5}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 4

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $8$ .

$\frac{(lim_{x \to 8} x^{7} - lim_{x \to 8} 11) \cdot lim_{x \to 8} x^{2} + 5}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 5

Move the exponent $7$ from $x^{7}$ outside the limit using the Limits Power Rule.

$\frac{({(lim_{x \to 8} x)}^{7} - lim_{x \to 8} 11) \cdot lim_{x \to 8} x^{2} + 5}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 6

Evaluate the limit of $11$ which is constant as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot lim_{x \to 8} x^{2} + 5}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 7

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot (lim_{x \to 8} x^{2} + lim_{x \to 8} 5)}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 8

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + lim_{x \to 8} 5)}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 9

Evaluate the limit of $5$ which is constant as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{lim_{x \to 8} (x^{n} - 8) (x^{3} + 18)}$

Step 10

Split the limit using the Product of Limits Rule on the limit as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{lim_{x \to 8} x^{n} - 8 \cdot lim_{x \to 8} x^{3} + 18}$

Step 11

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{(lim_{x \to 8} x^{n} - lim_{x \to 8} 8) \cdot lim_{x \to 8} x^{3} + 18}$

Step 12

Move the exponent $n$ from $x^{n}$ outside the limit using the Limits Power Rule.

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - lim_{x \to 8} 8) \cdot lim_{x \to 8} x^{3} + 18}$

Step 13

Evaluate the limit of $8$ which is constant as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - 1 \cdot 8) \cdot lim_{x \to 8} x^{3} + 18}$

Step 14

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - 1 \cdot 8) \cdot (lim_{x \to 8} x^{3} + lim_{x \to 8} 18)}$

Step 15

Move the exponent $3$ from $x^{3}$ outside the limit using the Limits Power Rule.

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - 1 \cdot 8) \cdot ({(lim_{x \to 8} x)}^{3} + lim_{x \to 8} 18)}$

Step 16

Evaluate the limit of $18$ which is constant as $x$ approaches $8$ .

$\frac{({(lim_{x \to 8} x)}^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - 1 \cdot 8) \cdot ({(lim_{x \to 8} x)}^{3} + 18)}$

Step 17

Evaluate the limits by plugging in $8$ for all occurrences of $x$ .

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Step 17.1

Evaluate the limit of $x$ by plugging in $8$ for $x$ .

$\frac{(8^{7} - 1 \cdot 11) \cdot ({(lim_{x \to 8} x)}^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - 1 \cdot 8) \cdot ({(lim_{x \to 8} x)}^{3} + 18)}$

Step 17.2

Evaluate the limit of $x$ by plugging in $8$ for $x$ .

$\frac{(8^{7} - 1 \cdot 11) \cdot (8^{2} + 5)}{({(lim_{x \to 8} x)}^{n} - 1 \cdot 8) \cdot ({(lim_{x \to 8} x)}^{3} + 18)}$

Step 17.3

Evaluate the limit of $x$ by plugging in $8$ for $x$ .

$\frac{(8^{7} - 1 \cdot 11) \cdot (8^{2} + 5)}{(8^{n} - 1 \cdot 8) \cdot ({(lim_{x \to 8} x)}^{3} + 18)}$

Step 17.4

Evaluate the limit of $x$ by plugging in $8$ for $x$ .

$\frac{(8^{7} - 1 \cdot 11) \cdot (8^{2} + 5)}{(8^{n} - 1 \cdot 8) \cdot (8^{3} + 18)}$

Step 18

Simplify the answer.

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Step 18.1

Simplify the numerator.

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Step 18.1.1

Raise $8$ to the power of $7$ .

$\frac{(2097152 - 1 \cdot 11) (8^{2} + 5)}{(8^{n} - 1 \cdot 8) \cdot (8^{3} + 18)}$

Step 18.1.2

Multiply $- 1$ by $11$ .

$\frac{(2097152 - 11) (8^{2} + 5)}{(8^{n} - 1 \cdot 8) \cdot (8^{3} + 18)}$

Step 18.1.3

Subtract $11$ from $2097152$ .

$\frac{2097141 (8^{2} + 5)}{(8^{n} - 1 \cdot 8) \cdot (8^{3} + 18)}$

Step 18.1.4

Raise $8$ to the power of $2$ .

$\frac{2097141 (64 + 5)}{(8^{n} - 1 \cdot 8) \cdot (8^{3} + 18)}$

Step 18.1.5

Add $64$ and $5$ .

$\frac{2097141 \cdot 69}{(8^{n} - 1 \cdot 8) \cdot (8^{3} + 18)}$

Step 18.2

Simplify the denominator.

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Step 18.2.1

Multiply $- 1$ by $8$ .

$\frac{2097141 \cdot 69}{(8^{n} - 8) (8^{3} + 18)}$

Step 18.2.2

Raise $8$ to the power of $3$ .

$\frac{2097141 \cdot 69}{(8^{n} - 8) (512 + 18)}$

Step 18.2.3

Add $512$ and $18$ .

$\frac{2097141 \cdot 69}{(8^{n} - 8) \cdot 530}$

Step 18.3

Multiply $2097141$ by $69$ .

$\frac{144702729}{(8^{n} - 8) \cdot 530}$

Step 18.4

Move $530$ to the left of $8^{n} - 8$ .

$\frac{144702729}{530 (8^{n} - 8)}$