Calculus Examples

$f (x) = x^{\frac{7}{2}} e^{x}$

Step 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 $f (x) = x^{\frac{7}{2}}$ and $g (x) = e^{x}$ .

$x^{\frac{7}{2}} \frac{d}{d x} [e^{x}] + e^{x} \frac{d}{d x} [x^{\frac{7}{2}}]$

Step 2

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$x^{\frac{7}{2}} e^{x} + e^{x} \frac{d}{d x} [x^{\frac{7}{2}}]$

Step 3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{7}{2}$ .

$x^{\frac{7}{2}} e^{x} + e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1})$

Step 4

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x^{\frac{7}{2}} e^{x} + e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1 \cdot \frac{2}{2}})$

Step 5

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

$x^{\frac{7}{2}} e^{x} + e^{x} (\frac{7}{2} x^{\frac{7}{2} + \frac{- 1 \cdot 2}{2}})$

Step 6

Combine the numerators over the common denominator.

$x^{\frac{7}{2}} e^{x} + e^{x} (\frac{7}{2} x^{\frac{7 - 1 \cdot 2}{2}})$

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

$x^{\frac{7}{2}} e^{x} + e^{x} (\frac{7}{2} x^{\frac{7 - 2}{2}})$

Step 7.2

Subtract $2$ from $7$ .

$x^{\frac{7}{2}} e^{x} + e^{x} (\frac{7}{2} x^{\frac{5}{2}})$

Step 8

Combine $\frac{7}{2}$ and $x^{\frac{5}{2}}$ .

$x^{\frac{7}{2}} e^{x} + e^{x} \frac{7 x^{\frac{5}{2}}}{2}$

Step 9

Combine $e^{x}$ and $\frac{7 x^{\frac{5}{2}}}{2}$ .

$x^{\frac{7}{2}} e^{x} + \frac{e^{x} (7 x^{\frac{5}{2}})}{2}$

Step 10

Simplify.

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Step 10.1

Reorder terms.

$e^{x} x^{\frac{7}{2}} + \frac{e^{x} (7 x^{\frac{5}{2}})}{2}$

Step 10.2

Move $7$ to the left of $e^{x}$ .

$e^{x} x^{\frac{7}{2}} + \frac{7 e^{x} x^{\frac{5}{2}}}{2}$