Calculus Examples

Solve the differential equation: $x \frac{d y}{d x} + y = (x^{2} + 3 x) e^{\frac{2}{3} x}$

Step 1

Check if the left side of the equation is the result of the derivative of the term $x y$ .

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Step 1.1

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x$ and $g (x) = y$ .

$x \frac{d}{d x} [y] + y \frac{d}{d x} [x]$

Step 1.2

Rewrite $\frac{d}{d x} [y]$ as $y'$ .

$x y' + y \frac{d}{d x} [x]$

Step 1.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$x y' + y \cdot 1$

Step 1.4

Substitute $\frac{d y}{d x}$ for $y'$ .

$x \frac{d y}{d x} + y \cdot 1$

Step 1.5

Reorder $y$ and $1$ .

$x \frac{d y}{d x} + 1 \cdot y$

Step 1.6

Multiply $y$ by $1$ .

$x \frac{d y}{d x} + y$

Step 2

Rewrite the left side as a result of differentiating a product.

$\frac{d}{d x} [x y] = (x^{2} + 3 x) e^{\frac{2}{3} x}$

Step 3

Set up an integral on each side.

$\int \frac{d}{d x} [x y] d x = \int (x^{2} + 3 x) e^{\frac{2}{3} x} d x$

Step 4

Integrate the left side.

$x y = \int (x^{2} + 3 x) e^{\frac{2}{3} x} d x$

Step 5

Integrate the right side.

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Step 5.1

Integrate by parts using the formula $\int u d v = u v - \int v d u$ , where $u = x^{2} + 3 x$ and $d v = e^{\frac{2}{3} x}$ .

$x y = (x^{2} + 3 x) (\frac{3}{2} e^{\frac{2}{3} x}) - \int \frac{3}{2} e^{\frac{2}{3} x} (2 x + 3) d x$

Step 5.2

Simplify.

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Step 5.2.1

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

$x y = (x^{2} + 3 x) (\frac{3}{2} e^{\frac{2 x}{3}}) - \int \frac{3}{2} e^{\frac{2}{3} x} (2 x + 3) d x$

Step 5.2.2

Combine $\frac{3}{2}$ and $e^{\frac{2 x}{3}}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{3}{2} e^{\frac{2}{3} x} (2 x + 3) d x$

Step 5.3

Since $\frac{3}{2}$ is constant with respect to $x$ , move $\frac{3}{2}$ out of the integral.

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - (\frac{3}{2} \int e^{\frac{2}{3} x} (2 x + 3) d x)$

Step 5.4

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

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} \int e^{\frac{2 x}{3}} (2 x + 3) d x$

Step 5.5

Integrate by parts using the formula $\int u d v = u v - \int v d u$ , where $u = 2 x + 3$ and $d v = e^{\frac{2 x}{3}}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) (\frac{3}{2} e^{\frac{2}{3} x}) - \int \frac{3}{2} e^{\frac{2}{3} x} \cdot 2 d x)$

Step 5.6

Simplify.

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Step 5.6.1

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

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) (\frac{3}{2} e^{\frac{2 x}{3}}) - \int \frac{3}{2} e^{\frac{2}{3} x} \cdot 2 d x)$

Step 5.6.2

Combine $\frac{3}{2}$ and $e^{\frac{2 x}{3}}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{3}{2} e^{\frac{2}{3} x} \cdot 2 d x)$

Step 5.6.3

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

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{3}{2} e^{\frac{2 x}{3}} \cdot 2 d x)$

Step 5.6.4

Combine $\frac{3}{2}$ and $e^{\frac{2 x}{3}}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{3 e^{\frac{2 x}{3}}}{2} \cdot 2 d x)$

Step 5.6.5

Combine $\frac{3 e^{\frac{2 x}{3}}}{2}$ and $2$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{3 e^{\frac{2 x}{3}} \cdot 2}{2} d x)$

Step 5.6.6

Multiply $2$ by $3$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{6 e^{\frac{2 x}{3}}}{2} d x)$

Step 5.6.7

Cancel the common factor of $6$ and $2$ .

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Step 5.6.7.1

Factor $2$ out of $6 e^{\frac{2 x}{3}}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{2 (3 e^{\frac{2 x}{3}})}{2} d x)$

Step 5.6.7.2

Cancel the common factors.

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Step 5.6.7.2.1

Factor $2$ out of $2$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{2 (3 e^{\frac{2 x}{3}})}{2 (1)} d x)$

Step 5.6.7.2.2

Cancel the common factor.

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{2 (3 e^{\frac{2 x}{3}})}{2 \cdot 1} d x)$

Step 5.6.7.2.3

Rewrite the expression.

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int \frac{3 e^{\frac{2 x}{3}}}{1} d x)$

Step 5.6.7.2.4

Divide $3 e^{\frac{2 x}{3}}$ by $1$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \int 3 e^{\frac{2 x}{3}} d x)$

Step 5.7

Since $3$ is constant with respect to $x$ , move $3$ out of the integral.

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - (3 \int e^{\frac{2 x}{3}} d x))$

Step 5.8

Multiply $3$ by $- 1$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 \int e^{\frac{2 x}{3}} d x)$

Step 5.9

Let $u = \frac{2 x}{3}$ . Then $d u = \frac{2}{3} d x$ , so $\frac{3}{2} d u = d x$ . Rewrite using $u$ and $d$ $u$ .

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Step 5.9.1

Let $u = \frac{2 x}{3}$ . Find $\frac{d u}{d x}$ .

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Step 5.9.1.1

Differentiate $\frac{2 x}{3}$ .

$\frac{d}{d x} [\frac{2 x}{3}]$

Step 5.9.1.2

Since $\frac{2}{3}$ is constant with respect to $x$ , the derivative of $\frac{2 x}{3}$ with respect to $x$ is $\frac{2}{3} \frac{d}{d x} [x]$ .

$\frac{2}{3} \frac{d}{d x} [x]$

Step 5.9.1.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$\frac{2}{3} \cdot 1$

Step 5.9.1.4

Multiply $\frac{2}{3}$ by $1$ .

$\frac{2}{3}$

Step 5.9.2

Rewrite the problem using $u$ and $d u$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 \int e^{u} \frac{1}{\frac{2}{3}} d u)$

Step 5.10

Simplify.

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Step 5.10.1

Multiply by the reciprocal of the fraction to divide by $\frac{2}{3}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 \int e^{u} (1 (\frac{3}{2})) d u)$

Step 5.10.2

Multiply $\frac{3}{2}$ by $1$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 \int e^{u} \frac{3}{2} d u)$

Step 5.10.3

Combine $e^{u}$ and $\frac{3}{2}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 \int \frac{e^{u} \cdot 3}{2} d u)$

Step 5.10.4

Move $3$ to the left of $e^{u}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 \int \frac{3 e^{u}}{2} d u)$

Step 5.11

Since $\frac{3}{2}$ is constant with respect to $u$ , move $\frac{3}{2}$ out of the integral.

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - 3 (\frac{3}{2} \int e^{u} d u))$

Step 5.12

Simplify.

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Step 5.12.1

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

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} + \frac{3 \cdot - 3}{2} \int e^{u} d u)$

Step 5.12.2

Multiply $3$ by $- 3$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} + \frac{- 9}{2} \int e^{u} d u)$

Step 5.12.3

Move the negative in front of the fraction.

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{9}{2} \int e^{u} d u)$

Step 5.13

The integral of $e^{u}$ with respect to $u$ is $e^{u}$ .

$x y = (x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{9}{2} (e^{u} + C))$

Step 5.14

Simplify.

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Step 5.14.1

Rewrite $(x^{2} + 3 x) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{9}{2} (e^{u} + C))$ as $\frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{9}{2} e^{u}) + C$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{9}{2} e^{u}) + C$

Step 5.14.2

Simplify.

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Step 5.14.2.1

Combine $e^{u}$ and $\frac{9}{2}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{e^{u} \cdot 9}{2}) + C$

Step 5.14.2.2

Move $9$ to the left of $e^{u}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} - \frac{9 \cdot e^{u}}{2}) + C$

Step 5.14.2.3

To write $(2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} ((2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} \cdot \frac{2}{2} - \frac{9 e^{u}}{2}) + C$

Step 5.14.2.4

Combine $(2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2}$ and $\frac{2}{2}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} (\frac{(2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} \cdot 2}{2} - \frac{9 e^{u}}{2}) + C$

Step 5.14.2.5

Combine the numerators over the common denominator.

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{2} \cdot 2 - 9 e^{u}}{2} + C$

Step 5.14.2.6

Combine $2$ and $\frac{3 e^{\frac{2 x}{3}}}{2}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{2 (3 e^{\frac{2 x}{3}})}{2} - 9 e^{u}}{2} + C$

Step 5.14.2.7

Multiply $3$ by $2$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{6 e^{\frac{2 x}{3}}}{2} - 9 e^{u}}{2} + C$

Step 5.14.2.8

Cancel the common factor of $6$ and $2$ .

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Step 5.14.2.8.1

Factor $2$ out of $6 e^{\frac{2 x}{3}}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{2 (3 e^{\frac{2 x}{3}})}{2} - 9 e^{u}}{2} + C$

Step 5.14.2.8.2

Cancel the common factors.

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Step 5.14.2.8.2.1

Factor $2$ out of $2$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{2 (3 e^{\frac{2 x}{3}})}{2 (1)} - 9 e^{u}}{2} + C$

Step 5.14.2.8.2.2

Cancel the common factor.

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{2 (3 e^{\frac{2 x}{3}})}{2 \cdot 1} - 9 e^{u}}{2} + C$

Step 5.14.2.8.2.3

Rewrite the expression.

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) \frac{3 e^{\frac{2 x}{3}}}{1} - 9 e^{u}}{2} + C$

Step 5.14.2.8.2.4

Divide $3 e^{\frac{2 x}{3}}$ by $1$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{(2 x + 3) (3 e^{\frac{2 x}{3}}) - 9 e^{u}}{2} + C$

Step 5.14.2.9

Move $3$ to the left of $2 x + 3$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3}{2} \cdot \frac{3 \cdot (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u}}{2} + C$

Step 5.14.2.10

Multiply $\frac{3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u}}{2}$ by $\frac{3}{2}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{(3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u}) \cdot 3}{2 \cdot 2} + C$

Step 5.14.2.11

Multiply $2$ by $2$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{(3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u}) \cdot 3}{4} + C$

Step 5.14.2.12

Move $3$ to the left of $3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u}$ .

$x y = \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} + \frac{x (9 e^{\frac{2 x}{3}})}{2} - \frac{3 \cdot (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u})}{4} + C$

Step 5.14.2.13

To write $\frac{x^{2} (3 e^{\frac{2 x}{3}})}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (3 e^{\frac{2 x}{3}})}{2} \cdot \frac{2}{2} - \frac{3 (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u})}{4} + C$

Step 5.14.2.14

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

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Step 5.14.2.14.1

Multiply $\frac{x^{2} (3 e^{\frac{2 x}{3}})}{2}$ by $\frac{2}{2}$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (3 e^{\frac{2 x}{3}}) \cdot 2}{2 \cdot 2} - \frac{3 (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u})}{4} + C$

Step 5.14.2.14.2

Multiply $2$ by $2$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (3 e^{\frac{2 x}{3}}) \cdot 2}{4} - \frac{3 (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u})}{4} + C$

Step 5.14.2.15

Combine the numerators over the common denominator.

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (3 e^{\frac{2 x}{3}}) \cdot 2 - 3 (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u})}{4} + C$

Step 5.14.2.16

Multiply $2$ by $3$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (6 e^{\frac{2 x}{3}}) - 3 (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{u})}{4} + C$

Step 5.15

Replace all occurrences of $u$ with $\frac{2 x}{3}$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (6 e^{\frac{2 x}{3}}) - 3 (3 (2 x + 3) e^{\frac{2 x}{3}} - 9 e^{\frac{2 x}{3}})}{4} + C$

Step 5.16

Simplify.

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Step 5.16.1

Apply the distributive property.

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (6 e^{\frac{2 x}{3}}) - 3 (3 (2 x + 3) e^{\frac{2 x}{3}}) - 3 (- 9 e^{\frac{2 x}{3}})}{4} + C$

Step 5.16.2

Multiply $3$ by $- 3$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (6 e^{\frac{2 x}{3}}) - 9 ((2 x + 3) e^{\frac{2 x}{3}}) - 3 (- 9 e^{\frac{2 x}{3}})}{4} + C$

Step 5.16.3

Multiply $- 9$ by $- 3$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (6 e^{\frac{2 x}{3}}) - 9 ((2 x + 3) e^{\frac{2 x}{3}}) + 27 e^{\frac{2 x}{3}}}{4} + C$

Step 5.16.4

Reorder factors in $- 9 (2 x + 3) e^{\frac{2 x}{3}} + 27 e^{\frac{2 x}{3}}$ .

$x y = \frac{x (9 e^{\frac{2 x}{3}})}{2} + \frac{x^{2} (6 e^{\frac{2 x}{3}}) - 9 e^{\frac{2 x}{3}} (2 x + 3) + 27 e^{\frac{2 x}{3}}}{4} + C$

Step 5.17

Reorder terms.

$x y = \frac{9}{2} x e^{\frac{2}{3} x} + \frac{1}{4} (x^{2} (6 e^{\frac{2}{3} x}) - 9 e^{\frac{2}{3} x} (2 x + 3) + 27 e^{\frac{2}{3} x}) + C$

Step 6

Solve for $y$ .

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Step 6.1

Simplify.

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Step 6.1.1

Simplify each term.

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Step 6.1.1.1

Rewrite using the commutative property of multiplication.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2}{3} x} - 9 e^{\frac{2}{3} x} (2 x + 3) + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.2

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

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 9 e^{\frac{2}{3} x} (2 x + 3) + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.3

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

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 9 e^{\frac{2 x}{3}} (2 x + 3) + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.4

Apply the distributive property.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 9 e^{\frac{2 x}{3}} (2 x) - 9 e^{\frac{2 x}{3}} \cdot 3 + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.5

Rewrite using the commutative property of multiplication.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 9 \cdot 2 e^{\frac{2 x}{3}} x - 9 e^{\frac{2 x}{3}} \cdot 3 + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.6

Multiply $3$ by $- 9$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 9 \cdot 2 e^{\frac{2 x}{3}} x - 27 e^{\frac{2 x}{3}} + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.7

Multiply $- 9$ by $2$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 18 e^{\frac{2 x}{3}} x - 27 e^{\frac{2 x}{3}} + 27 e^{\frac{2}{3} x}) + C$

Step 6.1.1.8

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

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 18 e^{\frac{2 x}{3}} x - 27 e^{\frac{2 x}{3}} + 27 e^{\frac{2 x}{3}}) + C$

Step 6.1.2

Combine the opposite terms in $6 x^{2} e^{\frac{2 x}{3}} - 18 e^{\frac{2 x}{3}} x - 27 e^{\frac{2 x}{3}} + 27 e^{\frac{2 x}{3}}$ .

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Step 6.1.2.1

Add $- 27 e^{\frac{2 x}{3}}$ and $27 e^{\frac{2 x}{3}}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 18 e^{\frac{2 x}{3}} x + 0) + C$

Step 6.1.2.2

Add $6 x^{2} e^{\frac{2 x}{3}} - 18 e^{\frac{2 x}{3}} x$ and $0$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} \cdot (6 x^{2} e^{\frac{2 x}{3}} - 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.3

Apply the distributive property.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{4} (6 x^{2} e^{\frac{2 x}{3}}) + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.4

Cancel the common factor of $2$ .

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Step 6.1.4.1

Factor $2$ out of $4$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{2 (2)} (6 x^{2} e^{\frac{2 x}{3}}) + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.4.2

Factor $2$ out of $6 x^{2} e^{\frac{2 x}{3}}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{2 (2)} (2 (3 x^{2} e^{\frac{2 x}{3}})) + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.4.3

Cancel the common factor.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{2 \cdot 2} (2 (3 x^{2} e^{\frac{2 x}{3}})) + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.4.4

Rewrite the expression.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{1}{2} (3 x^{2} e^{\frac{2 x}{3}}) + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.5

Combine $3$ and $\frac{1}{2}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3}{2} (x^{2} e^{\frac{2 x}{3}}) + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.6

Combine $x^{2}$ and $\frac{3}{2}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3}{2} e^{\frac{2 x}{3}} + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.7

Combine $\frac{x^{2} \cdot 3}{2}$ and $e^{\frac{2 x}{3}}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{1}{4} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.8

Cancel the common factor of $2$ .

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Step 6.1.8.1

Factor $2$ out of $4$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{1}{2 (2)} (- 18 e^{\frac{2 x}{3}} x) + C$

Step 6.1.8.2

Factor $2$ out of $- 18 e^{\frac{2 x}{3}} x$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{1}{2 (2)} (2 (- 9 e^{\frac{2 x}{3}} x)) + C$

Step 6.1.8.3

Cancel the common factor.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{1}{2 \cdot 2} (2 (- 9 e^{\frac{2 x}{3}} x)) + C$

Step 6.1.8.4

Rewrite the expression.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{1}{2} (- 9 e^{\frac{2 x}{3}} x) + C$

Step 6.1.9

Combine $- 9$ and $\frac{1}{2}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{- 9}{2} (e^{\frac{2 x}{3}} x) + C$

Step 6.1.10

Combine $e^{\frac{2 x}{3}}$ and $\frac{- 9}{2}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{e^{\frac{2 x}{3}} \cdot - 9}{2} x + C$

Step 6.1.11

Combine $\frac{e^{\frac{2 x}{3}} \cdot - 9}{2}$ and $x$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{x^{2} \cdot 3 e^{\frac{2 x}{3}}}{2} + \frac{e^{\frac{2 x}{3}} \cdot - 9 x}{2} + C$

Step 6.1.12

Simplify each term.

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Step 6.1.12.1

Move $3$ to the left of $x^{2}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 \cdot x^{2} e^{\frac{2 x}{3}}}{2} + \frac{e^{\frac{2 x}{3}} \cdot - 9 x}{2} + C$

Step 6.1.12.2

Move $- 9$ to the left of $e^{\frac{2 x}{3}}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} + \frac{- 9 \cdot e^{\frac{2 x}{3}} x}{2} + C$

Step 6.1.12.3

Move the negative in front of the fraction.

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 e^{\frac{2 x}{3}} x}{2} + C$

Step 6.1.13

Reorder factors in $\frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 e^{\frac{2 x}{3}} x}{2}$ .

$x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C$

Step 6.1.14

Remove parentheses.

$x y = \frac{9}{2} \cdot x e^{\frac{2}{3} x} + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C$

Step 6.2

Divide each term in $x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C$ by $x$ and simplify.

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Step 6.2.1

Divide each term in $x y = \frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C$ by $x$ .

$\frac{x y}{x} = \frac{\frac{9}{2} \cdot (x e^{\frac{2}{3} x})}{x} + \frac{\frac{3 x^{2} e^{\frac{2 x}{3}}}{2}}{x} + \frac{- \frac{9 x e^{\frac{2 x}{3}}}{2}}{x} + \frac{C}{x}$

Step 6.2.2

Simplify the left side.

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Step 6.2.2.1

Cancel the common factor of $x$ .

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Step 6.2.2.1.1

Cancel the common factor.

$\frac{x y}{x} = \frac{\frac{9}{2} \cdot (x e^{\frac{2}{3} x})}{x} + \frac{\frac{3 x^{2} e^{\frac{2 x}{3}}}{2}}{x} + \frac{- \frac{9 x e^{\frac{2 x}{3}}}{2}}{x} + \frac{C}{x}$

Step 6.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{\frac{9}{2} \cdot (x e^{\frac{2}{3} x})}{x} + \frac{\frac{3 x^{2} e^{\frac{2 x}{3}}}{2}}{x} + \frac{- \frac{9 x e^{\frac{2 x}{3}}}{2}}{x} + \frac{C}{x}$

Step 6.2.3

Simplify the right side.

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Step 6.2.3.1

Simplify terms.

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Step 6.2.3.1.1

Combine the numerators over the common denominator.

$y = \frac{\frac{9}{2} \cdot (x e^{\frac{2}{3} x}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C}{x}$

Step 6.2.3.1.2

Simplify each term.

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Step 6.2.3.1.2.1

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

$y = \frac{\frac{9}{2} \cdot (x e^{\frac{2 x}{3}}) + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C}{x}$

Step 6.2.3.1.2.2

Multiply $\frac{9}{2} (x e^{\frac{2 x}{3}})$ .

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Step 6.2.3.1.2.2.1

Combine $x$ and $\frac{9}{2}$ .

$y = \frac{\frac{x \cdot 9}{2} e^{\frac{2 x}{3}} + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C}{x}$

Step 6.2.3.1.2.2.2

Combine $\frac{x \cdot 9}{2}$ and $e^{\frac{2 x}{3}}$ .

$y = \frac{\frac{x \cdot 9 e^{\frac{2 x}{3}}}{2} + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C}{x}$

Step 6.2.3.1.2.3

Move $9$ to the left of $x$ .

$y = \frac{\frac{9 x e^{\frac{2 x}{3}}}{2} + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2} - \frac{9 x e^{\frac{2 x}{3}}}{2} + C}{x}$

Step 6.2.3.1.3

Simplify terms.

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Step 6.2.3.1.3.1

Combine the numerators over the common denominator.

$y = \frac{C + \frac{9 x e^{\frac{2 x}{3}} + 3 x^{2} e^{\frac{2 x}{3}} - 9 x e^{\frac{2 x}{3}}}{2}}{x}$

Step 6.2.3.1.3.2

Combine the opposite terms in $9 x e^{\frac{2 x}{3}} + 3 x^{2} e^{\frac{2 x}{3}} - 9 x e^{\frac{2 x}{3}}$ .

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Step 6.2.3.1.3.2.1

Subtract $9 x e^{\frac{2 x}{3}}$ from $9 x e^{\frac{2 x}{3}}$ .

$y = \frac{C + \frac{3 x^{2} e^{\frac{2 x}{3}} + 0}{2}}{x}$

Step 6.2.3.1.3.2.2

Add $3 x^{2} e^{\frac{2 x}{3}}$ and $0$ .

$y = \frac{C + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2}}{x}$

Step 6.2.3.2

Simplify the numerator.

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Step 6.2.3.2.1

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

$y = \frac{C \cdot \frac{2}{2} + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2}}{x}$

Step 6.2.3.2.2

Combine $C$ and $\frac{2}{2}$ .

$y = \frac{\frac{C \cdot 2}{2} + \frac{3 x^{2} e^{\frac{2 x}{3}}}{2}}{x}$

Step 6.2.3.2.3

Combine the numerators over the common denominator.

$y = \frac{\frac{C \cdot 2 + 3 x^{2} e^{\frac{2 x}{3}}}{2}}{x}$

Step 6.2.3.2.4

Move $2$ to the left of $C$ .

$y = \frac{\frac{2 C + 3 x^{2} e^{\frac{2 x}{3}}}{2}}{x}$

Step 6.2.3.3

Multiply the numerator by the reciprocal of the denominator.

$y = \frac{2 C + 3 x^{2} e^{\frac{2 x}{3}}}{2} \cdot \frac{1}{x}$

Step 6.2.3.4

Multiply $\frac{2 C + 3 x^{2} e^{\frac{2 x}{3}}}{2}$ by $\frac{1}{x}$ .

$y = \frac{2 C + 3 x^{2} e^{\frac{2 x}{3}}}{2 x}$