Calculus Examples

$\frac{lim_{x \to 8} 2 x^{\frac{5}{3}} - x^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 1

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

$\frac{lim_{x \to 8} 2 x^{\frac{5}{3}} - lim_{x \to 8} x^{\frac{1}{3}} + lim_{x \to 8} 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 2

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

$\frac{2 lim_{x \to 8} x^{\frac{5}{3}} - lim_{x \to 8} x^{\frac{1}{3}} + lim_{x \to 8} 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 3

Move the exponent $\frac{5}{3}$ from $x^{\frac{5}{3}}$ outside the limit using the Limits Power Rule.

$\frac{2 {(lim_{x \to 8} x)}^{\frac{5}{3}} - lim_{x \to 8} x^{\frac{1}{3}} + lim_{x \to 8} 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 4

Move the exponent $\frac{1}{3}$ from $x^{\frac{1}{3}}$ outside the limit using the Limits Power Rule.

$\frac{2 {(lim_{x \to 8} x)}^{\frac{5}{3}} - {(lim_{x \to 8} x)}^{\frac{1}{3}} + lim_{x \to 8} 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 5

Evaluate the limit of $7$ which is constant as $x$ approaches $8$ .

$\frac{2 {(lim_{x \to 8} x)}^{\frac{5}{3}} - {(lim_{x \to 8} x)}^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 6

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

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Step 6.1

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

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

Step 6.2

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

$\frac{2 \cdot 8^{\frac{5}{3}} - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7

Simplify the answer.

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Step 7.1

Simplify the numerator.

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Step 7.1.1

Rewrite $8$ as $2^{3}$ .

$\frac{2 \cdot {(2^{3})}^{\frac{5}{3}} - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{2 \cdot 2^{3 (\frac{5}{3})} - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.3

Cancel the common factor of $3$ .

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Step 7.1.3.1

Cancel the common factor.

$\frac{2 \cdot 2^{3 (\frac{5}{3})} - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.3.2

Rewrite the expression.

$\frac{2 \cdot 2^{5} - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.4

Raise $2$ to the power of $5$ .

$\frac{2 \cdot 32 - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.5

Multiply $2$ by $32$ .

$\frac{64 - 8^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.6

Rewrite $8$ as $2^{3}$ .

$\frac{64 - {(2^{3})}^{\frac{1}{3}} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.7

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{64 - 2^{3 (\frac{1}{3})} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.8

Cancel the common factor of $3$ .

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Step 7.1.8.1

Cancel the common factor.

$\frac{64 - 2^{3 (\frac{1}{3})} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.8.2

Rewrite the expression.

$\frac{64 - 2^{1} + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.9

Evaluate the exponent.

$\frac{64 - 1 \cdot 2 + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.10

Multiply $- 1$ by $2$ .

$\frac{64 - 2 + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.11

Subtract $2$ from $64$ .

$\frac{62 + 7}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.1.12

Add $62$ and $7$ .

$\frac{69}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$

Step 7.2

Multiply $\frac{69}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$ by $\frac{x^{\frac{8}{5}} + 3 - \sqrt{x}}{x^{\frac{8}{5}} + 3 - \sqrt{x}}$ .

$\frac{69}{x^{\frac{8}{5}} + 3 + \sqrt{x}} \cdot \frac{x^{\frac{8}{5}} + 3 - \sqrt{x}}{x^{\frac{8}{5}} + 3 - \sqrt{x}}$

Step 7.3

Multiply $\frac{69}{x^{\frac{8}{5}} + 3 + \sqrt{x}}$ by $\frac{x^{\frac{8}{5}} + 3 - \sqrt{x}}{x^{\frac{8}{5}} + 3 - \sqrt{x}}$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{(x^{\frac{8}{5}} + 3 + \sqrt{x}) (x^{\frac{8}{5}} + 3 - \sqrt{x})}$

Step 7.4

Expand the denominator using the FOIL method.

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{x^{\frac{16}{5}} + x^{\frac{8}{5}} \cdot 3 - x^{\frac{21}{10}} + 3 x^{\frac{8}{5}} + 9 - 3 \sqrt{x} + x^{\frac{21}{10}} + \sqrt{x} \cdot 3 - {\sqrt{x}}^{2}}$

Step 7.5

Simplify.

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{x^{\frac{16}{5}} + 6 x^{\frac{8}{5}} + 9 - x}$

Step 7.6

Reorder terms.

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- x + 6 x^{\frac{8}{5}} + x^{\frac{16}{5}} + 9}$

Step 7.7

Factor $- 1$ out of $- x$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x) + 6 x^{\frac{8}{5}} + x^{\frac{16}{5}} + 9}$

Step 7.8

Factor $- 1$ out of $6 x^{\frac{8}{5}}$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x) - (- 6 x^{\frac{8}{5}}) + x^{\frac{16}{5}} + 9}$

Step 7.9

Factor $- 1$ out of $- (x) - (- 6 x^{\frac{8}{5}})$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x - 6 x^{\frac{8}{5}}) + x^{\frac{16}{5}} + 9}$

Step 7.10

Factor $- 1$ out of $x^{\frac{16}{5}}$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x - 6 x^{\frac{8}{5}}) - 1 (- x^{\frac{16}{5}}) + 9}$

Step 7.11

Factor $- 1$ out of $- (x - 6 x^{\frac{8}{5}}) - 1 (- x^{\frac{16}{5}})$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}}) + 9}$

Step 7.12

Rewrite $9$ as $- 1 (- 9)$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}}) - 1 (- 9)}$

Step 7.13

Factor $- 1$ out of $- (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}}) - 1 (- 9)$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}} - 9)}$

Step 7.14

Rewrite $- (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}} - 9)$ as $- 1 (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}} - 9)$ .

$\frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{- 1 (x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}} - 9)}$

Step 7.15

Move the negative in front of the fraction.

$- \frac{69 (x^{\frac{8}{5}} + 3 - \sqrt{x})}{x - 6 x^{\frac{8}{5}} - x^{\frac{16}{5}} - 9}$