Calculus Examples

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

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x^{2} e^{x}$ and $g (x) = x^{2} + e^{x}$ .

$\frac{(x^{2} + e^{x}) \frac{d}{d x} [x^{2} e^{x}] - x^{2} e^{x} \frac{d}{d x} [x^{2} + e^{x}]}{{(x^{2} + e^{x})}^{2}}$

Step 2

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 $f (x) = x^{2}$ and $g (x) = e^{x}$ .

$\frac{(x^{2} + e^{x}) (x^{2} \frac{d}{d x} [e^{x}] + e^{x} \frac{d}{d x} [x^{2}]) - x^{2} e^{x} \frac{d}{d x} [x^{2} + e^{x}]}{{(x^{2} + e^{x})}^{2}}$

Step 3

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

$\frac{(x^{2} + e^{x}) (x^{2} e^{x} + e^{x} \frac{d}{d x} [x^{2}]) - x^{2} e^{x} \frac{d}{d x} [x^{2} + e^{x}]}{{(x^{2} + e^{x})}^{2}}$

Step 4

Differentiate.

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Step 4.1

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

$\frac{(x^{2} + e^{x}) (x^{2} e^{x} + e^{x} (2 x)) - x^{2} e^{x} \frac{d}{d x} [x^{2} + e^{x}]}{{(x^{2} + e^{x})}^{2}}$

Step 4.2

By the Sum Rule, the derivative of $x^{2} + e^{x}$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [e^{x}]$ .

$\frac{(x^{2} + e^{x}) (x^{2} e^{x} + e^{x} (2 x)) - x^{2} e^{x} (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [e^{x}])}{{(x^{2} + e^{x})}^{2}}$

Step 4.3

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

$\frac{(x^{2} + e^{x}) (x^{2} e^{x} + e^{x} (2 x)) - x^{2} e^{x} (2 x + \frac{d}{d x} [e^{x}])}{{(x^{2} + e^{x})}^{2}}$

Step 5

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

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

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

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

Step 6.2

Simplify the numerator.

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Step 6.2.1

Simplify each term.

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Step 6.2.1.1

Rewrite using the commutative property of multiplication.

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

Step 6.2.1.2

Expand $(x^{2} + e^{x}) (x^{2} e^{x} + 2 e^{x} x)$ using the FOIL Method.

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Step 6.2.1.2.1

Apply the distributive property.

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

Step 6.2.1.2.2

Apply the distributive property.

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

Step 6.2.1.2.3

Apply the distributive property.

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

Step 6.2.1.3

Simplify each term.

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Step 6.2.1.3.1

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

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Step 6.2.1.3.1.1

Move $x^{2}$ .

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

Step 6.2.1.3.1.2

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

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

Step 6.2.1.3.1.3

Add $2$ and $2$ .

$\frac{x^{4} e^{x} + x^{2} (2 e^{x} x) + e^{x} (x^{2} e^{x}) + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.2

Rewrite using the commutative property of multiplication.

$\frac{x^{4} e^{x} + 2 x^{2} (e^{x} x) + e^{x} (x^{2} e^{x}) + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.3

Multiply $x^{2}$ by $x$ by adding the exponents.

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Step 6.2.1.3.3.1

Move $x$ .

$\frac{x^{4} e^{x} + 2 (x \cdot x^{2}) e^{x} + e^{x} (x^{2} e^{x}) + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.3.2

Multiply $x$ by $x^{2}$ .

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Step 6.2.1.3.3.2.1

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

$\frac{x^{4} e^{x} + 2 (x^{1} x^{2}) e^{x} + e^{x} (x^{2} e^{x}) + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.3.2.2

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

$\frac{x^{4} e^{x} + 2 x^{1 + 2} e^{x} + e^{x} (x^{2} e^{x}) + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.3.3

Add $1$ and $2$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{x} (x^{2} e^{x}) + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.4

Multiply $e^{x}$ by $e^{x}$ by adding the exponents.

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Step 6.2.1.3.4.1

Move $e^{x}$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{x} e^{x} x^{2} + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.4.2

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

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{x + x} x^{2} + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.4.3

Add $x$ and $x$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + e^{x} (2 e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.5

Rewrite using the commutative property of multiplication.

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{x} (e^{x} x) - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.6

Multiply $e^{x}$ by $e^{x}$ by adding the exponents.

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Step 6.2.1.3.6.1

Move $e^{x}$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 (e^{x} e^{x}) x - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.6.2

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

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{x + x} x - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.3.6.3

Add $x$ and $x$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - x^{2} e^{x} (2 x) - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.4

Multiply $x^{2}$ by $x$ by adding the exponents.

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Step 6.2.1.4.1

Move $x$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - (x \cdot x^{2}) e^{x} \cdot 2 - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.4.2

Multiply $x$ by $x^{2}$ .

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Step 6.2.1.4.2.1

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

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - (x^{1} x^{2}) e^{x} \cdot 2 - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.4.2.2

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

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - x^{1 + 2} e^{x} \cdot 2 - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.4.3

Add $1$ and $2$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - x^{3} e^{x} \cdot 2 - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.5

Multiply $2$ by $- 1$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - 2 x^{3} e^{x} - x^{2} e^{x} e^{x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.6

Multiply $e^{x}$ by $e^{x}$ by adding the exponents.

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Step 6.2.1.6.1

Move $e^{x}$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - 2 x^{3} e^{x} - x^{2} (e^{x} e^{x})}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.6.2

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

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - 2 x^{3} e^{x} - x^{2} e^{x + x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.1.6.3

Add $x$ and $x$ .

$\frac{x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - 2 x^{3} e^{x} - x^{2} e^{2 x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.2

Combine the opposite terms in $x^{4} e^{x} + 2 x^{3} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - 2 x^{3} e^{x} - x^{2} e^{2 x}$ .

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Step 6.2.2.1

Subtract $2 x^{3} e^{x}$ from $2 x^{3} e^{x}$ .

$\frac{x^{4} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x + 0 - x^{2} e^{2 x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.2.2

Add $x^{4} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x$ and $0$ .

$\frac{x^{4} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - x^{2} e^{2 x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.2.3

Reorder the factors in the terms $e^{2 x} x^{2}$ and $- x^{2} e^{2 x}$ .

$\frac{x^{4} e^{x} + e^{2 x} x^{2} + 2 e^{2 x} x - e^{2 x} x^{2}}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.2.4

Subtract $e^{2 x} x^{2}$ from $e^{2 x} x^{2}$ .

$\frac{x^{4} e^{x} + 2 e^{2 x} x + 0}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.2.5

Add $x^{4} e^{x} + 2 e^{2 x} x$ and $0$ .

$\frac{x^{4} e^{x} + 2 e^{2 x} x}{{(x^{2} + e^{x})}^{2}}$

Step 6.2.3

Reorder factors in $x^{4} e^{x} + 2 e^{2 x} x$ .

$\frac{x^{4} e^{x} + 2 x e^{2 x}}{{(x^{2} + e^{x})}^{2}}$

Step 6.3

Reorder terms.

$\frac{e^{x} x^{4} + 2 e^{2 x} x}{{(x^{2} + e^{x})}^{2}}$

Step 6.4

Factor $x$ out of $e^{x} x^{4} + 2 e^{2 x} x$ .

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Step 6.4.1

Factor $x$ out of $e^{x} x^{4}$ .

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

Step 6.4.2

Factor $x$ out of $2 e^{2 x} x$ .

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

Step 6.4.3

Factor $x$ out of $x (e^{x} x^{3}) + x (2 e^{2 x})$ .

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

Step 6.5

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

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