Calculus Examples

$f (x) = \frac{e^{(7 x^{2} - 3)}}{\ln (3 x + 5)}$

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 $f (x) = e^{7 x^{2} - 3}$ and $g (x) = \ln (3 x + 5)$ .

$\frac{\ln (3 x + 5) \frac{d}{d x} [e^{7 x^{2} - 3}] - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = e^{x}$ and $g (x) = 7 x^{2} - 3$ .

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Step 2.1

To apply the Chain Rule, set $u_{1}$ as $7 x^{2} - 3$ .

$\frac{\ln (3 x + 5) (\frac{d}{d u_{1}} [e^{u_{1}}] \frac{d}{d x} [7 x^{2} - 3]) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 2.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$\frac{\ln (3 x + 5) (e^{u_{1}} \frac{d}{d x} [7 x^{2} - 3]) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 2.3

Replace all occurrences of $u_{1}$ with $7 x^{2} - 3$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} \frac{d}{d x} [7 x^{2} - 3]) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $7 x^{2} - 3$ with respect to $x$ is $\frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [- 3]$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (\frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [- 3])) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 3.2

Since $7$ is constant with respect to $x$ , the derivative of $7 x^{2}$ with respect to $x$ is $7 \frac{d}{d x} [x^{2}]$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (7 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 3])) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 3.3

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

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (7 (2 x) + \frac{d}{d x} [- 3])) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 3.4

Multiply $2$ by $7$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x + \frac{d}{d x} [- 3])) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 3.5

Since $- 3$ is constant with respect to $x$ , the derivative of $- 3$ with respect to $x$ is $0$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x + 0)) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 3.6

Add $14 x$ and $0$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - e^{7 x^{2} - 3} \frac{d}{d x} [\ln (3 x + 5)]}{\ln^{2} (3 x + 5)}$

Step 4

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \ln (x)$ and $g (x) = 3 x + 5$ .

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Step 4.1

To apply the Chain Rule, set $u_{2}$ as $3 x + 5$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - e^{7 x^{2} - 3} (\frac{d}{d u_{2}} [\ln (u_{2})] \frac{d}{d x} [3 x + 5])}{\ln^{2} (3 x + 5)}$

Step 4.2

The derivative of $\ln (u_{2})$ with respect to $u_{2}$ is $\frac{1}{u_{2}}$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - e^{7 x^{2} - 3} (\frac{1}{u_{2}} \frac{d}{d x} [3 x + 5])}{\ln^{2} (3 x + 5)}$

Step 4.3

Replace all occurrences of $u_{2}$ with $3 x + 5$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - e^{7 x^{2} - 3} (\frac{1}{3 x + 5} \frac{d}{d x} [3 x + 5])}{\ln^{2} (3 x + 5)}$

Step 5

Differentiate.

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Step 5.1

Combine $\frac{1}{3 x + 5}$ and $e^{7 x^{2} - 3}$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} \frac{d}{d x} [3 x + 5]}{\ln^{2} (3 x + 5)}$

Step 5.2

By the Sum Rule, the derivative of $3 x + 5$ with respect to $x$ is $\frac{d}{d x} [3 x] + \frac{d}{d x} [5]$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} (\frac{d}{d x} [3 x] + \frac{d}{d x} [5])}{\ln^{2} (3 x + 5)}$

Step 5.3

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

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} (3 \frac{d}{d x} [x] + \frac{d}{d x} [5])}{\ln^{2} (3 x + 5)}$

Step 5.4

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

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} (3 \cdot 1 + \frac{d}{d x} [5])}{\ln^{2} (3 x + 5)}$

Step 5.5

Multiply $3$ by $1$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} (3 + \frac{d}{d x} [5])}{\ln^{2} (3 x + 5)}$

Step 5.6

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} (3 + 0)}{\ln^{2} (3 x + 5)}$

Step 5.7

Combine fractions.

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Step 5.7.1

Add $3$ and $0$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{e^{7 x^{2} - 3}}{3 x + 5} \cdot 3}{\ln^{2} (3 x + 5)}$

Step 5.7.2

Multiply $3$ by $- 1$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - 3 \frac{e^{7 x^{2} - 3}}{3 x + 5}}{\ln^{2} (3 x + 5)}$

Step 5.7.3

Combine $- 3$ and $\frac{e^{7 x^{2} - 3}}{3 x + 5}$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) + \frac{- 3 e^{7 x^{2} - 3}}{3 x + 5}}{\ln^{2} (3 x + 5)}$

Step 5.7.4

Move the negative in front of the fraction.

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) - \frac{3 e^{7 x^{2} - 3}}{3 x + 5}}{\ln^{2} (3 x + 5)}$

Step 6

To write $\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x))$ as a fraction with a common denominator, multiply by $\frac{3 x + 5}{3 x + 5}$ .

$\frac{\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) (3 x + 5)}{3 x + 5} - \frac{3 e^{7 x^{2} - 3}}{3 x + 5}}{\ln^{2} (3 x + 5)}$

Step 7

Combine the numerators over the common denominator.

$\frac{\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) (3 x + 5) - 3 e^{7 x^{2} - 3}}{3 x + 5}}{\ln^{2} (3 x + 5)}$

Step 8

Rewrite $\frac{\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) (3 x + 5) - 3 e^{7 x^{2} - 3}}{3 x + 5}}{\ln^{2} (3 x + 5)}$ as a product.

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) (3 x + 5) - 3 e^{7 x^{2} - 3}}{3 x + 5} \cdot \frac{1}{\ln^{2} (3 x + 5)}$

Step 9

Multiply $\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) (3 x + 5) - 3 e^{7 x^{2} - 3}}{3 x + 5}$ by $\frac{1}{\ln^{2} (3 x + 5)}$ .

$\frac{\ln (3 x + 5) (e^{7 x^{2} - 3} (14 x)) (3 x + 5) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10

Simplify.

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Step 10.1

Simplify the numerator.

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Step 10.1.1

Simplify each term.

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Step 10.1.1.1

Rewrite using the commutative property of multiplication.

$\frac{14 \ln (3 x + 5) (e^{7 x^{2} - 3} x) (3 x + 5) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.2

Simplify $14 \ln (3 x + 5)$ by moving $14$ inside the logarithm.

$\frac{\ln ({(3 x + 5)}^{14}) (e^{7 x^{2} - 3} x) (3 x + 5) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.3

Apply the distributive property.

$\frac{\ln ({(3 x + 5)}^{14}) (e^{7 x^{2} - 3} x) (3 x) + \ln ({(3 x + 5)}^{14}) (e^{7 x^{2} - 3} x) \cdot 5 - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.4

Rewrite using the commutative property of multiplication.

$\frac{3 \ln ({(3 x + 5)}^{14}) e^{7 x^{2} - 3} x \cdot x + \ln ({(3 x + 5)}^{14}) (e^{7 x^{2} - 3} x) \cdot 5 - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.5

Multiply $\ln ({(3 x + 5)}^{14}) (e^{7 x^{2} - 3} x) \cdot 5$ .

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Step 10.1.1.5.1

Reorder $\ln ({(3 x + 5)}^{14})$ and $5$ .

$\frac{3 \ln ({(3 x + 5)}^{14}) e^{7 x^{2} - 3} x \cdot x + e^{7 x^{2} - 3} x \cdot (5 \cdot \ln ({(3 x + 5)}^{14})) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.5.2

Simplify $5 \cdot \ln ({(3 x + 5)}^{14})$ by moving $5$ inside the logarithm.

$\frac{3 \ln ({(3 x + 5)}^{14}) e^{7 x^{2} - 3} x \cdot x + e^{7 x^{2} - 3} x \cdot \ln ({({(3 x + 5)}^{14})}^{5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6

Simplify each term.

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Step 10.1.1.6.1

Multiply $x$ by $x$ by adding the exponents.

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Step 10.1.1.6.1.1

Move $x$ .

$\frac{3 \ln ({(3 x + 5)}^{14}) e^{7 x^{2} - 3} (x \cdot x) + e^{7 x^{2} - 3} x \cdot \ln ({({(3 x + 5)}^{14})}^{5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6.1.2

Multiply $x$ by $x$ .

$\frac{3 \ln ({(3 x + 5)}^{14}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \cdot \ln ({({(3 x + 5)}^{14})}^{5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6.2

Simplify $3 \ln ({(3 x + 5)}^{14})$ by moving $3$ inside the logarithm.

$\frac{\ln ({({(3 x + 5)}^{14})}^{3}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \cdot \ln ({({(3 x + 5)}^{14})}^{5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6.3

Multiply the exponents in ${({(3 x + 5)}^{14})}^{3}$ .

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Step 10.1.1.6.3.1

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

$\frac{\ln ({(3 x + 5)}^{14 \cdot 3}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \cdot \ln ({({(3 x + 5)}^{14})}^{5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6.3.2

Multiply $14$ by $3$ .

$\frac{\ln ({(3 x + 5)}^{42}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \cdot \ln ({({(3 x + 5)}^{14})}^{5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6.4

Multiply the exponents in ${({(3 x + 5)}^{14})}^{5}$ .

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Step 10.1.1.6.4.1

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

$\frac{\ln ({(3 x + 5)}^{42}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \cdot \ln ({(3 x + 5)}^{14 \cdot 5}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.1.6.4.2

Multiply $14$ by $5$ .

$\frac{\ln ({(3 x + 5)}^{42}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \cdot \ln ({(3 x + 5)}^{70}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

$\frac{\ln ({(3 x + 5)}^{42}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \ln ({(3 x + 5)}^{70}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.1.2

Reorder factors in $\ln ({(3 x + 5)}^{42}) e^{7 x^{2} - 3} x^{2} + e^{7 x^{2} - 3} x \ln ({(3 x + 5)}^{70}) - 3 e^{7 x^{2} - 3}$ .

$\frac{x^{2} e^{7 x^{2} - 3} \ln ({(3 x + 5)}^{42}) + x e^{7 x^{2} - 3} \ln ({(3 x + 5)}^{70}) - 3 e^{7 x^{2} - 3}}{(3 x + 5) \ln^{2} (3 x + 5)}$

Step 10.2

Reorder terms.

$\frac{e^{7 x^{2} - 3} x^{2} \ln ({(3 x + 5)}^{42}) + e^{7 x^{2} - 3} x \ln ({(3 x + 5)}^{70}) - 3 e^{7 x^{2} - 3}}{\ln^{2} (3 x + 5) (3 x + 5)}$