Calculus Examples

$\int 5 x (x - 4) (3 x + 5) d x$

Step 1

Since

$5$ is constant with respect to

$x$ , move

$5$ out of the integral.

$5 \int (x (x - 4)) (3 x + 5) d x$

Step 2

Let

$u = 3 x + 5$ . Then

$d u = 3 d x$ , so

$\frac{1}{3} d u = d x$ . Rewrite using

$u$ and

$d$

$u$ .

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Step 2.1

Let

$u = 3 x + 5$ . Find

$\frac{d u}{d x}$ .

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Step 2.1.1

Differentiate

$3 x + 5$ .

$\frac{d}{d x} [3 x + 5]$

Step 2.1.2

By the Sum Rule, the derivative of

$3 x + 5$ with respect to

$x$ is

$\frac{d}{d x} [3 x] + \frac{d}{d x} [5]$ .

$\frac{d}{d x} [3 x] + \frac{d}{d x} [5]$

Step 2.1.3

Evaluate

$\frac{d}{d x} [3 x]$ .

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Step 2.1.3.1

Since

$3$ is constant with respect to

$x$ , the derivative of

$3 x$ with respect to

$x$ is

$3 \frac{d}{d x} [x]$ .

$3 \frac{d}{d x} [x] + \frac{d}{d x} [5]$

Step 2.1.3.2

Differentiate using the Power Rule which states that

$\frac{d}{d x} [x^{n}]$ is

$n x^{n - 1}$ where

$n = 1$ .

$3 \cdot 1 + \frac{d}{d x} [5]$

Step 2.1.3.3

Multiply

$3$ by

$1$ .

$3 + \frac{d}{d x} [5]$

$3 + \frac{d}{d x} [5]$

Step 2.1.4

Differentiate using the Constant Rule.

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Step 2.1.4.1

Since

$5$ is constant with respect to

$x$ , the derivative of

$5$ with respect to

$x$ is

$0$ .

$3 + 0$

Step 2.1.4.2

Add

$3$ and

$0$ .

$3$

$3$

$3$

Step 2.2

Rewrite the problem using

$u$ and

$d u$ .

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{5}{3} - 4) u \frac{1}{3} d u$

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{5}{3} - 4) u \frac{1}{3} d u$

Step 3

Simplify.

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Step 3.1

To write

$- 4$ as a fraction with a common denominator, multiply by

$\frac{3}{3}$ .

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{5}{3} - 4 \cdot \frac{3}{3}) u \frac{1}{3} d u$

Step 3.2

Combine

$- 4$ and

$\frac{3}{3}$ .

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{5}{3} + \frac{- 4 \cdot 3}{3}) u \frac{1}{3} d u$

Step 3.3

Combine the numerators over the common denominator.

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} + \frac{- 5 - 4 \cdot 3}{3}) u \frac{1}{3} d u$

Step 3.4

Simplify the numerator.

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Step 3.4.1

Multiply

$- 4$ by

$3$ .

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} + \frac{- 5 - 12}{3}) u \frac{1}{3} d u$

Step 3.4.2

Subtract

$12$ from

$- 5$ .

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} + \frac{- 17}{3}) u \frac{1}{3} d u$

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} + \frac{- 17}{3}) u \frac{1}{3} d u$

Step 3.5

Move the negative in front of the fraction.

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{17}{3}) u \frac{1}{3} d u$

Step 3.6

Combine

$\frac{1}{3}$ and

$u$ .

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{17}{3}) \frac{u}{3} d u$

$5 \int (\frac{u}{3} - \frac{5}{3}) (\frac{u}{3} - \frac{17}{3}) \frac{u}{3} d u$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$5 \int (\frac{u}{3} (\frac{u}{3} - \frac{17}{3}) - \frac{5}{3} (\frac{u}{3} - \frac{17}{3})) \frac{u}{3} d u$

Step 4.2

Apply the distributive property.

$5 \int (\frac{u}{3} \cdot \frac{u}{3} + \frac{u}{3} (- \frac{17}{3}) - \frac{5}{3} (\frac{u}{3} - \frac{17}{3})) \frac{u}{3} d u$

Step 4.3

Apply the distributive property.

$5 \int (\frac{u}{3} \cdot \frac{u}{3} + \frac{u}{3} (- \frac{17}{3}) - \frac{5}{3} \cdot \frac{u}{3} - \frac{5}{3} (- \frac{17}{3})) \frac{u}{3} d u$

Step 4.4

Apply the distributive property.

$5 \int (\frac{u}{3} \cdot \frac{u}{3} + \frac{u}{3} (- \frac{17}{3})) \frac{u}{3} + (- \frac{5}{3} \cdot \frac{u}{3} - \frac{5}{3} (- \frac{17}{3})) \frac{u}{3} d u$

Step 4.5

Apply the distributive property.

$5 \int \frac{u}{3} \cdot \frac{u}{3} \frac{u}{3} + \frac{u}{3} (- \frac{17}{3}) \frac{u}{3} + (- \frac{5}{3} \cdot \frac{u}{3} - \frac{5}{3} (- \frac{17}{3})) \frac{u}{3} d u$

Step 4.6

Apply the distributive property.

$5 \int \frac{u}{3} \cdot \frac{u}{3} \frac{u}{3} + \frac{u}{3} (- \frac{17}{3}) \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - \frac{5}{3} (- \frac{17}{3}) \frac{u}{3} d u$

Step 4.7

Reorder

$\frac{u}{3}$ and

$- 1$ .

$5 \int \frac{u}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - \frac{5}{3} (- \frac{17}{3}) \frac{u}{3} d u$

Step 4.8

Move

$\frac{5}{3}$ .

$5 \int \frac{u}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.9

Multiply

$\frac{u}{3}$ by

$\frac{u}{3}$ .

$5 \int \frac{u \cdot u}{3 \cdot 3} \cdot \frac{u}{3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.10

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{1} u}{3 \cdot 3} \cdot \frac{u}{3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.11

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{1} u^{1}}{3 \cdot 3} \cdot \frac{u}{3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.12

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$5 \int \frac{u^{1 + 1}}{3 \cdot 3} \cdot \frac{u}{3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.13

Add

$1$ and

$1$ .

$5 \int \frac{u^{2}}{3 \cdot 3} \cdot \frac{u}{3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.14

Multiply

$3$ by

$3$ .

$5 \int \frac{u^{2}}{9} \cdot \frac{u}{3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.15

Multiply

$\frac{u^{2}}{9}$ by

$\frac{u}{3}$ .

$5 \int \frac{u^{2} u}{9 \cdot 3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.16

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{2} u^{1}}{9 \cdot 3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.17

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$5 \int \frac{u^{2 + 1}}{9 \cdot 3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.18

Add

$2$ and

$1$ .

$5 \int \frac{u^{3}}{9 \cdot 3} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.19

Multiply

$9$ by

$3$ .

$5 \int \frac{u^{3}}{27} - 1 \frac{u}{3} \frac{17}{3} \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.20

Combine

$- 1 \frac{u}{3}$ and

$\frac{17}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u}{3} \cdot 17}{3} \cdot \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.21

Combine

$\frac{u}{3}$ and

$17$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17}{3}}{3} \cdot \frac{u}{3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.22

Multiply

$\frac{- 1 \frac{u \cdot 17}{3}}{3}$ by

$\frac{u}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17}{3} u}{3 \cdot 3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.23

Combine

$\frac{u \cdot 17}{3}$ and

$u$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{3 \cdot 3} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.24

Multiply

$3$ by

$3$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5}{3} \cdot \frac{u}{3} \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.25

Combine

$- \frac{5}{3}$ and

$\frac{u}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u}{3 \cdot 3} \cdot \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.26

Multiply

$3$ by

$3$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u}{9} \cdot \frac{u}{3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.27

Combine

$- \frac{5 u}{9}$ and

$\frac{u}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u \cdot u}{9 \cdot 3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.28

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 (u^{1} u)}{9 \cdot 3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.29

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 (u^{1} u^{1})}{9 \cdot 3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.30

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{1 + 1}}{9 \cdot 3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.31

Add

$1$ and

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{9 \cdot 3} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.32

Multiply

$9$ by

$3$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} - 1 \cdot - 1 \frac{5}{3} \frac{17}{3} \frac{u}{3} d u$

Step 4.33

Multiply

$- 1$ by

$- 1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + 1 (\frac{5}{3}) \frac{17}{3} \frac{u}{3} d u$

Step 4.34

Multiply

$\frac{5}{3}$ by

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{5}{3} \cdot \frac{17}{3} \frac{u}{3} d u$

Step 4.35

Multiply

$\frac{5}{3}$ by

$\frac{17}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{5 \cdot 17}{3 \cdot 3} \cdot \frac{u}{3} d u$

Step 4.36

Multiply

$5$ by

$17$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85}{3 \cdot 3} \cdot \frac{u}{3} d u$

Step 4.37

Multiply

$3$ by

$3$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85}{9} \cdot \frac{u}{3} d u$

Step 4.38

Multiply

$\frac{85}{9}$ by

$\frac{u}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{9 \cdot 3} d u$

Step 4.39

Multiply

$9$ by

$3$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{u \cdot 17 u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5

Simplify.

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Step 5.1

Move

$17$ to the left of

$u$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{17 \cdot u \cdot u}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.2

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{17 (u^{1} u)}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.3

Raise

$u$ to the power of

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{17 (u^{1} u^{1})}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.4

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{17 u^{1 + 1}}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.5

Add

$1$ and

$1$ .

$5 \int \frac{u^{3}}{27} + \frac{- 1 \frac{17 u^{2}}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.6

Rewrite

$- 1 \frac{17 u^{2}}{3}$ as

$- \frac{17 u^{2}}{3}$ .

$5 \int \frac{u^{3}}{27} + \frac{- \frac{17 u^{2}}{3}}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.7

Rewrite

$\frac{- \frac{17 u^{2}}{3}}{9}$ as a product.

$5 \int \frac{u^{3}}{27} - \frac{17 u^{2}}{3} \cdot \frac{1}{9} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.8

Multiply

$\frac{1}{9}$ by

$\frac{17 u^{2}}{3}$ .

$5 \int \frac{u^{3}}{27} - \frac{17 u^{2}}{9 \cdot 3} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 5.9

Multiply

$9$ by

$3$ .

$5 \int \frac{u^{3}}{27} - \frac{17 u^{2}}{27} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

$5 \int \frac{u^{3}}{27} - \frac{17 u^{2}}{27} - \frac{5 u^{2}}{27} + \frac{85 u}{27} d u$

Step 6

Split the single integral into multiple integrals.

$5 (\int \frac{u^{3}}{27} d u + \int - \frac{17 u^{2}}{27} d u + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 7

Since

$\frac{1}{27}$ is constant with respect to

$u$ , move

$\frac{1}{27}$ out of the integral.

$5 (\frac{1}{27} \int u^{3} d u + \int - \frac{17 u^{2}}{27} d u + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 8

By the Power Rule, the integral of

$u^{3}$ with respect to

$u$ is

$\frac{1}{4} u^{4}$ .

$5 (\frac{1}{27} (\frac{1}{4} u^{4} + C) + \int - \frac{17 u^{2}}{27} d u + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 9

Combine

$\frac{1}{4}$ and

$u^{4}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) + \int - \frac{17 u^{2}}{27} d u + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 10

Since

$- 1$ is constant with respect to

$u$ , move

$- 1$ out of the integral.

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \int \frac{17 u^{2}}{27} d u + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 11

Since

$\frac{17}{27}$ is constant with respect to

$u$ , move

$\frac{17}{27}$ out of the integral.

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - (\frac{17}{27} \int u^{2} d u) + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 12

By the Power Rule, the integral of

$u^{2}$ with respect to

$u$ is

$\frac{1}{3} u^{3}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{1}{3} u^{3} + C) + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 13

Combine

$\frac{1}{3}$ and

$u^{3}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) + \int - \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 14

Since

$- 1$ is constant with respect to

$u$ , move

$- 1$ out of the integral.

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - \int \frac{5 u^{2}}{27} d u + \int \frac{85 u}{27} d u)$

Step 15

Since

$\frac{5}{27}$ is constant with respect to

$u$ , move

$\frac{5}{27}$ out of the integral.

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - (\frac{5}{27} \int u^{2} d u) + \int \frac{85 u}{27} d u)$

Step 16

By the Power Rule, the integral of

$u^{2}$ with respect to

$u$ is

$\frac{1}{3} u^{3}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - \frac{5}{27} (\frac{1}{3} u^{3} + C) + \int \frac{85 u}{27} d u)$

Step 17

Combine

$\frac{1}{3}$ and

$u^{3}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - \frac{5}{27} (\frac{u^{3}}{3} + C) + \int \frac{85 u}{27} d u)$

Step 18

Since

$\frac{85}{27}$ is constant with respect to

$u$ , move

$\frac{85}{27}$ out of the integral.

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - \frac{5}{27} (\frac{u^{3}}{3} + C) + \frac{85}{27} \int u d u)$

Step 19

By the Power Rule, the integral of

$u$ with respect to

$u$ is

$\frac{1}{2} u^{2}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - \frac{5}{27} (\frac{u^{3}}{3} + C) + \frac{85}{27} (\frac{1}{2} u^{2} + C))$

Step 20

Simplify.

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Step 20.1

Combine

$\frac{1}{2}$ and

$u^{2}$ .

$5 (\frac{1}{27} (\frac{u^{4}}{4} + C) - \frac{17}{27} (\frac{u^{3}}{3} + C) - \frac{5}{27} (\frac{u^{3}}{3} + C) + \frac{85}{27} (\frac{u^{2}}{2} + C))$

Step 20.2

Simplify.

$5 (\frac{u^{4}}{108} - \frac{17 u^{3}}{81} - \frac{5 u^{3}}{81} + \frac{85 u^{2}}{54}) + C$

Step 20.3

Simplify.

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Step 20.3.1

Combine the numerators over the common denominator.

$5 (\frac{u^{4}}{108} + \frac{- 17 u^{3} - 5 u^{3}}{81} + \frac{85 u^{2}}{54}) + C$

Step 20.3.2

Subtract

$5 u^{3}$ from

$- 17 u^{3}$ .

$5 (\frac{u^{4}}{108} + \frac{- 22 u^{3}}{81} + \frac{85 u^{2}}{54}) + C$

Step 20.3.3

Move the negative in front of the fraction.

$5 (\frac{u^{4}}{108} - \frac{22 u^{3}}{81} + \frac{85 u^{2}}{54}) + C$

$5 (\frac{u^{4}}{108} - \frac{22 u^{3}}{81} + \frac{85 u^{2}}{54}) + C$

$5 (\frac{u^{4}}{108} - \frac{22 u^{3}}{81} + \frac{85 u^{2}}{54}) + C$

Step 21

Replace all occurrences of

$u$ with

$3 x + 5$ .

$5 (\frac{{(3 x + 5)}^{4}}{108} - \frac{22 {(3 x + 5)}^{3}}{81} + \frac{85 {(3 x + 5)}^{2}}{54}) + C$

Step 22

Reorder terms.

$5 (\frac{1}{108} {(3 x + 5)}^{4} - \frac{22}{81} {(3 x + 5)}^{3} + \frac{85}{54} {(3 x + 5)}^{2}) + C$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$