Calculus Examples

$lim_{x \to - \frac{5}{2}} \frac{6 x^{2} + 11 x - 10}{8 x^{2} - 18 x - 5}$

Step 1

Split the limit using the Limits Quotient Rule on the limit as $x$ approaches $- \frac{5}{2}$ .

$\frac{lim_{x \to - \frac{5}{2}} 6 x^{2} + 11 x - 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - 18 x - 5}$

Step 2

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $- \frac{5}{2}$ .

$\frac{lim_{x \to - \frac{5}{2}} 6 x^{2} + lim_{x \to - \frac{5}{2}} 11 x - lim_{x \to - \frac{5}{2}} 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - 18 x - 5}$

Step 3

Move the term $6$ outside of the limit because it is constant with respect to $x$ .

$\frac{6 lim_{x \to - \frac{5}{2}} x^{2} + lim_{x \to - \frac{5}{2}} 11 x - lim_{x \to - \frac{5}{2}} 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - 18 x - 5}$

Step 4

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

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + lim_{x \to - \frac{5}{2}} 11 x - lim_{x \to - \frac{5}{2}} 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - 18 x - 5}$

Step 5

Move the term $11$ outside of the limit because it is constant with respect to $x$ .

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - lim_{x \to - \frac{5}{2}} 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - 18 x - 5}$

Step 6

Evaluate the limit of $10$ which is constant as $x$ approaches $- \frac{5}{2}$ .

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - 18 x - 5}$

Step 7

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $- \frac{5}{2}$ .

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{lim_{x \to - \frac{5}{2}} 8 x^{2} - lim_{x \to - \frac{5}{2}} 18 x - lim_{x \to - \frac{5}{2}} 5}$

Step 8

Move the term $8$ outside of the limit because it is constant with respect to $x$ .

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{8 lim_{x \to - \frac{5}{2}} x^{2} - lim_{x \to - \frac{5}{2}} 18 x - lim_{x \to - \frac{5}{2}} 5}$

Step 9

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

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{8 {(lim_{x \to - \frac{5}{2}} x)}^{2} - lim_{x \to - \frac{5}{2}} 18 x - lim_{x \to - \frac{5}{2}} 5}$

Step 10

Move the term $18$ outside of the limit because it is constant with respect to $x$ .

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{8 {(lim_{x \to - \frac{5}{2}} x)}^{2} - 18 lim_{x \to - \frac{5}{2}} x - lim_{x \to - \frac{5}{2}} 5}$

Step 11

Evaluate the limit of $5$ which is constant as $x$ approaches $- \frac{5}{2}$ .

$\frac{6 {(lim_{x \to - \frac{5}{2}} x)}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{8 {(lim_{x \to - \frac{5}{2}} x)}^{2} - 18 lim_{x \to - \frac{5}{2}} x - 1 \cdot 5}$

Step 12

Evaluate the limits by plugging in $- \frac{5}{2}$ for all occurrences of $x$ .

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Step 12.1

Evaluate the limit of $x$ by plugging in $- \frac{5}{2}$ for $x$ .

$\frac{6 {(- \frac{5}{2})}^{2} + 11 lim_{x \to - \frac{5}{2}} x - 1 \cdot 10}{8 {(lim_{x \to - \frac{5}{2}} x)}^{2} - 18 lim_{x \to - \frac{5}{2}} x - 1 \cdot 5}$

Step 12.2

Evaluate the limit of $x$ by plugging in $- \frac{5}{2}$ for $x$ .

$\frac{6 {(- \frac{5}{2})}^{2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(lim_{x \to - \frac{5}{2}} x)}^{2} - 18 lim_{x \to - \frac{5}{2}} x - 1 \cdot 5}$

Step 12.3

Evaluate the limit of $x$ by plugging in $- \frac{5}{2}$ for $x$ .

$\frac{6 {(- \frac{5}{2})}^{2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 lim_{x \to - \frac{5}{2}} x - 1 \cdot 5}$

Step 12.4

Evaluate the limit of $x$ by plugging in $- \frac{5}{2}$ for $x$ .

$\frac{6 {(- \frac{5}{2})}^{2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13

Simplify the answer.

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Step 13.1

Simplify the numerator.

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Step 13.1.1

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 13.1.1.1

Apply the product rule to $- \frac{5}{2}$ .

$\frac{6 ({(- 1)}^{2} {(\frac{5}{2})}^{2}) + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.1.2

Apply the product rule to $\frac{5}{2}$ .

$\frac{6 ({(- 1)}^{2} \frac{5^{2}}{2^{2}}) + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.2

Raise $- 1$ to the power of $2$ .

$\frac{6 (1 \frac{5^{2}}{2^{2}}) + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.3

Multiply $\frac{5^{2}}{2^{2}}$ by $1$ .

$\frac{6 \frac{5^{2}}{2^{2}} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.4

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

$\frac{6 \frac{25}{2^{2}} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.5

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

$\frac{6 (\frac{25}{4}) + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.6

Cancel the common factor of $2$ .

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Step 13.1.6.1

Factor $2$ out of $6$ .

$\frac{2 (3) \frac{25}{4} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.6.2

Factor $2$ out of $4$ .

$\frac{2 \cdot 3 \frac{25}{2 \cdot 2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.6.3

Cancel the common factor.

$\frac{2 \cdot 3 \frac{25}{2 \cdot 2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.6.4

Rewrite the expression.

$\frac{3 (\frac{25}{2}) + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.7

Combine $3$ and $\frac{25}{2}$ .

$\frac{\frac{3 \cdot 25}{2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.8

Multiply $3$ by $25$ .

$\frac{\frac{75}{2} + 11 (- \frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.9

Multiply $11 (- \frac{5}{2})$ .

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Step 13.1.9.1

Multiply $- 1$ by $11$ .

$\frac{\frac{75}{2} - 11 (\frac{5}{2}) - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.9.2

Combine $- 11$ and $\frac{5}{2}$ .

$\frac{\frac{75}{2} + \frac{- 11 \cdot 5}{2} - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.9.3

Multiply $- 11$ by $5$ .

$\frac{\frac{75}{2} + \frac{- 55}{2} - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.10

Move the negative in front of the fraction.

$\frac{\frac{75}{2} - \frac{55}{2} - 1 \cdot 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.11

Multiply $- 1$ by $10$ .

$\frac{\frac{75}{2} - \frac{55}{2} - 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.12

Combine the numerators over the common denominator.

$\frac{\frac{75 - 55}{2} - 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.13

Subtract $55$ from $75$ .

$\frac{\frac{20}{2} - 10}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.14

To write $- 10$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{\frac{20}{2} - 10 \cdot \frac{2}{2}}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.15

Combine $- 10$ and $\frac{2}{2}$ .

$\frac{\frac{20}{2} + \frac{- 10 \cdot 2}{2}}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.16

Combine the numerators over the common denominator.

$\frac{\frac{20 - 10 \cdot 2}{2}}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.17

Simplify the numerator.

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Step 13.1.17.1

Multiply $- 10$ by $2$ .

$\frac{\frac{20 - 20}{2}}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.17.2

Subtract $20$ from $20$ .

$\frac{\frac{0}{2}}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.1.18

Divide $0$ by $2$ .

$\frac{0}{8 {(- \frac{5}{2})}^{2} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2

Simplify the denominator.

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Step 13.2.1

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 13.2.1.1

Apply the product rule to $- \frac{5}{2}$ .

$\frac{0}{8 ({(- 1)}^{2} {(\frac{5}{2})}^{2}) - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.1.2

Apply the product rule to $\frac{5}{2}$ .

$\frac{0}{8 ({(- 1)}^{2} \frac{5^{2}}{2^{2}}) - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.2

Raise $- 1$ to the power of $2$ .

$\frac{0}{8 (1 \frac{5^{2}}{2^{2}}) - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.3

Multiply $\frac{5^{2}}{2^{2}}$ by $1$ .

$\frac{0}{8 \frac{5^{2}}{2^{2}} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.4

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

$\frac{0}{8 \frac{25}{2^{2}} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.5

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

$\frac{0}{8 (\frac{25}{4}) - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.6

Cancel the common factor of $4$ .

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Step 13.2.6.1

Factor $4$ out of $8$ .

$\frac{0}{4 (2) \frac{25}{4} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.6.2

Cancel the common factor.

$\frac{0}{4 \cdot 2 \frac{25}{4} - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.6.3

Rewrite the expression.

$\frac{0}{2 \cdot 25 - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.7

Multiply $2$ by $25$ .

$\frac{0}{50 - 18 (- \frac{5}{2}) - 1 \cdot 5}$

Step 13.2.8

Cancel the common factor of $2$ .

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Step 13.2.8.1

Move the leading negative in $- \frac{5}{2}$ into the numerator.

$\frac{0}{50 - 18 (\frac{- 5}{2}) - 1 \cdot 5}$

Step 13.2.8.2

Factor $2$ out of $- 18$ .

$\frac{0}{50 + 2 (- 9) \frac{- 5}{2} - 1 \cdot 5}$

Step 13.2.8.3

Cancel the common factor.

$\frac{0}{50 + 2 \cdot - 9 \frac{- 5}{2} - 1 \cdot 5}$

Step 13.2.8.4

Rewrite the expression.

$\frac{0}{50 - 9 \cdot - 5 - 1 \cdot 5}$

Step 13.2.9

Multiply $- 9$ by $- 5$ .

$\frac{0}{50 + 45 - 1 \cdot 5}$

Step 13.2.10

Multiply $- 1$ by $5$ .

$\frac{0}{50 + 45 - 5}$

Step 13.2.11

Add $50$ and $45$ .

$\frac{0}{95 - 5}$

Step 13.2.12

Subtract $5$ from $95$ .

$\frac{0}{90}$

Step 13.3

Divide $0$ by $90$ .

$0$