Calculus Examples

$\int_{25}^{3} 6 \frac{\ln (y)}{\sqrt{y}} d y$

Step 1

Combine $6$ and $\frac{\ln (y)}{\sqrt{y}}$ .

$\int_{25}^{3} \frac{6 \ln (y)}{\sqrt{y}} d y$

Step 2

Since $6$ is constant with respect to $y$ , move $6$ out of the integral.

$6 \int_{25}^{3} \frac{\ln (y)}{\sqrt{y}} d y$

Step 3

Rewrite $\frac{\ln (y)}{\sqrt{y}}$ as a product.

$6 \int_{25}^{3} \ln (y) \frac{1}{\sqrt{y}} d y$

Step 4

Integrate by parts using the formula $\int u d v = u v - \int v d u$ , where $u = \ln (y)$ and $d v = \frac{1}{\sqrt{y}}$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} 2 y^{\frac{1}{2}} \frac{1}{y} d y)$

Step 5

Simplify.

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Step 5.1

Combine $2$ and $\frac{1}{y}$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} y^{\frac{1}{2}} \frac{2}{y} d y)$

Step 5.2

Combine $y^{\frac{1}{2}}$ and $\frac{2}{y}$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{y^{\frac{1}{2}} \cdot 2}{y} d y)$

Step 5.3

Move $2$ to the left of $y^{\frac{1}{2}}$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2 \cdot y^{\frac{1}{2}}}{y} d y)$

Step 5.4

Move $y^{\frac{1}{2}}$ to the denominator using the negative exponent rule $b^{n} = \frac{1}{b^{- n}}$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2}{y \cdot y^{- \frac{1}{2}}} d y)$

Step 5.5

Multiply $y$ by $y^{- \frac{1}{2}}$ by adding the exponents.

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Step 5.5.1

Multiply $y$ by $y^{- \frac{1}{2}}$ .

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Step 5.5.1.1

Raise $y$ to the power of $1$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2}{y^{1} y^{- \frac{1}{2}}} d y)$

Step 5.5.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2}{y^{1 - \frac{1}{2}}} d y)$

Step 5.5.2

Write $1$ as a fraction with a common denominator.

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2}{y^{\frac{2}{2} - \frac{1}{2}}} d y)$

Step 5.5.3

Combine the numerators over the common denominator.

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2}{y^{\frac{2 - 1}{2}}} d y)$

Step 5.5.4

Subtract $1$ from $2$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - \int_{25}^{3} \frac{2}{y^{\frac{1}{2}}} d y)$

Step 6

Since $2$ is constant with respect to $y$ , move $2$ out of the integral.

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - (2 \int_{25}^{3} \frac{1}{y^{\frac{1}{2}}} d y))$

Step 7

Simplify the expression.

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Step 7.1

Multiply $2$ by $- 1$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - 2 \int_{25}^{3} \frac{1}{y^{\frac{1}{2}}} d y)$

Step 7.2

Move $y^{\frac{1}{2}}$ out of the denominator by raising it to the $- 1$ power.

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - 2 \int_{25}^{3} {(y^{\frac{1}{2}})}^{- 1} d y)$

Step 7.3

Multiply the exponents in ${(y^{\frac{1}{2}})}^{- 1}$ .

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Step 7.3.1

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

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - 2 \int_{25}^{3} y^{\frac{1}{2} \cdot - 1} d y)$

Step 7.3.2

Combine $\frac{1}{2}$ and $- 1$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - 2 \int_{25}^{3} y^{\frac{- 1}{2}} d y)$

Step 7.3.3

Move the negative in front of the fraction.

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - 2 \int_{25}^{3} y^{- \frac{1}{2}} d y)$

Step 8

By the Power Rule, the integral of $y^{- \frac{1}{2}}$ with respect to $y$ is $2 y^{\frac{1}{2}}$ .

$6 (\ln (y) (2 y^{\frac{1}{2}})]_{25}^{3} - 2 (2 y^{\frac{1}{2}}]_{25}^{3}))$

Step 9

Substitute and simplify.

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Step 9.1

Evaluate $\ln (y) (2 y^{\frac{1}{2}})$ at $3$ and at $25$ .

$6 ((\ln (3) (2 \cdot 3^{\frac{1}{2}})) - \ln (25) (2 \cdot 25^{\frac{1}{2}}) - 2 (2 y^{\frac{1}{2}}]_{25}^{3}))$

Step 9.2

Evaluate $2 y^{\frac{1}{2}}$ at $3$ and at $25$ .

$6 ((\ln (3) (2 \cdot 3^{\frac{1}{2}})) - \ln (25) (2 \cdot 25^{\frac{1}{2}}) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3

Simplify.

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Step 9.3.1

Move $2$ to the left of $\ln (3)$ .

$6 (2 \cdot \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) (2 \cdot 25^{\frac{1}{2}}) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.2

Rewrite $25$ as $5^{2}$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) (2 \cdot {(5^{2})}^{\frac{1}{2}}) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.3

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

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) (2 \cdot 5^{2 (\frac{1}{2})}) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.4

Cancel the common factor of $2$ .

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Step 9.3.4.1

Cancel the common factor.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) (2 \cdot 5^{2 (\frac{1}{2})}) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.4.2

Rewrite the expression.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) (2 \cdot 5^{1}) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.5

Evaluate the exponent.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) (2 \cdot 5) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.6

Multiply $2$ by $5$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - \ln (25) \cdot 10 - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.7

Multiply $10$ by $- 1$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 ((2 \cdot 3^{\frac{1}{2}}) - 2 \cdot 25^{\frac{1}{2}}))$

Step 9.3.8

Rewrite $25$ as $5^{2}$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 (2 \cdot 3^{\frac{1}{2}} - 2 \cdot {(5^{2})}^{\frac{1}{2}}))$

Step 9.3.9

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

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 (2 \cdot 3^{\frac{1}{2}} - 2 \cdot 5^{2 (\frac{1}{2})}))$

Step 9.3.10

Cancel the common factor of $2$ .

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Step 9.3.10.1

Cancel the common factor.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 (2 \cdot 3^{\frac{1}{2}} - 2 \cdot 5^{2 (\frac{1}{2})}))$

Step 9.3.10.2

Rewrite the expression.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 (2 \cdot 3^{\frac{1}{2}} - 2 \cdot 5^{1}))$

Step 9.3.11

Evaluate the exponent.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 (2 \cdot 3^{\frac{1}{2}} - 2 \cdot 5))$

Step 9.3.12

Multiply $- 2$ by $5$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (25) - 2 (2 \cdot 3^{\frac{1}{2}} - 10))$

Step 10

Simplify.

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Step 10.1

Simplify each term.

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Step 10.1.1

Rewrite $\ln (25)$ as $\ln (5^{2})$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 \ln (5^{2}) - 2 (2 \cdot 3^{\frac{1}{2}} - 10))$

Step 10.1.2

Expand $\ln (5^{2})$ by moving $2$ outside the logarithm.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 10 (2 \ln (5)) - 2 (2 \cdot 3^{\frac{1}{2}} - 10))$

Step 10.1.3

Multiply $2$ by $- 10$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 20 \ln (5) - 2 (2 \cdot 3^{\frac{1}{2}} - 10))$

Step 10.1.4

Apply the distributive property.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 20 \ln (5) - 2 (2 \cdot 3^{\frac{1}{2}}) - 2 \cdot - 10)$

Step 10.1.5

Multiply $2$ by $- 2$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 20 \ln (5) - 4 \cdot 3^{\frac{1}{2}} - 2 \cdot - 10)$

Step 10.1.6

Multiply $- 2$ by $- 10$ .

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}} - 20 \ln (5) - 4 \cdot 3^{\frac{1}{2}} + 20)$

Step 10.2

Apply the distributive property.

$6 (2 \ln (3) \cdot 3^{\frac{1}{2}}) + 6 (- 20 \ln (5)) + 6 (- 4 \cdot 3^{\frac{1}{2}}) + 6 \cdot 20$

Step 10.3

Simplify.

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Step 10.3.1

Multiply $2$ by $6$ .

$12 (\ln (3) \cdot 3^{\frac{1}{2}}) + 6 (- 20 \ln (5)) + 6 (- 4 \cdot 3^{\frac{1}{2}}) + 6 \cdot 20$

Step 10.3.2

Multiply $- 20$ by $6$ .

$12 (\ln (3) \cdot 3^{\frac{1}{2}}) - 120 \ln (5) + 6 (- 4 \cdot 3^{\frac{1}{2}}) + 6 \cdot 20$

Step 10.3.3

Multiply $- 4$ by $6$ .

$12 (\ln (3) \cdot 3^{\frac{1}{2}}) - 120 \ln (5) - 24 \cdot 3^{\frac{1}{2}} + 6 \cdot 20$

Step 10.3.4

Multiply $6$ by $20$ .

$12 (\ln (3) \cdot 3^{\frac{1}{2}}) - 120 \ln (5) - 24 \cdot 3^{\frac{1}{2}} + 120$

$12 \ln (3) \cdot 3^{\frac{1}{2}} - 120 \ln (5) - 24 \cdot 3^{\frac{1}{2}} + 120$

Step 11

The result can be shown in multiple forms.

Exact Form:

$12 \ln (3) \cdot 3^{\frac{1}{2}} - 120 \ln (5) - 24 \cdot 3^{\frac{1}{2}} + 120$

Decimal Form:

$- 91.86754125 \dots$