Calculus Examples

$y = \frac{x^{4}}{{(6 x + 1)}^{3}}$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\frac{x^{4}}{{(6 x + 1)}^{3}})$

Step 2

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 3

Differentiate the right side of the equation.

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Step 3.1

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 $f (x) = x^{4}$ and $g (x) = {(6 x + 1)}^{3}$ .

$\frac{{(6 x + 1)}^{3} \frac{d}{d x} [x^{4}] - x^{4} \frac{d}{d x} [{(6 x + 1)}^{3}]}{{({(6 x + 1)}^{3})}^{2}}$

Step 3.2

Differentiate using the Power Rule.

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Step 3.2.1

Multiply the exponents in ${({(6 x + 1)}^{3})}^{2}$ .

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Step 3.2.1.1

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

$\frac{{(6 x + 1)}^{3} \frac{d}{d x} [x^{4}] - x^{4} \frac{d}{d x} [{(6 x + 1)}^{3}]}{{(6 x + 1)}^{3 \cdot 2}}$

Step 3.2.1.2

Multiply $3$ by $2$ .

$\frac{{(6 x + 1)}^{3} \frac{d}{d x} [x^{4}] - x^{4} \frac{d}{d x} [{(6 x + 1)}^{3}]}{{(6 x + 1)}^{6}}$

Step 3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

$\frac{{(6 x + 1)}^{3} (4 x^{3}) - x^{4} \frac{d}{d x} [{(6 x + 1)}^{3}]}{{(6 x + 1)}^{6}}$

Step 3.2.3

Move $4$ to the left of ${(6 x + 1)}^{3}$ .

$\frac{4 \cdot {(6 x + 1)}^{3} x^{3} - x^{4} \frac{d}{d x} [{(6 x + 1)}^{3}]}{{(6 x + 1)}^{6}}$

Step 3.3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{3}$ and $g (x) = 6 x + 1$ .

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Step 3.3.1

To apply the Chain Rule, set $u$ as $6 x + 1$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - x^{4} (\frac{d}{d u} [u^{3}] \frac{d}{d x} [6 x + 1])}{{(6 x + 1)}^{6}}$

Step 3.3.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = 3$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - x^{4} (3 u^{2} \frac{d}{d x} [6 x + 1])}{{(6 x + 1)}^{6}}$

Step 3.3.3

Replace all occurrences of $u$ with $6 x + 1$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - x^{4} (3 {(6 x + 1)}^{2} \frac{d}{d x} [6 x + 1])}{{(6 x + 1)}^{6}}$

Step 3.4

Differentiate.

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Step 3.4.1

Multiply $3$ by $- 1$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} \frac{d}{d x} [6 x + 1])}{{(6 x + 1)}^{6}}$

Step 3.4.2

By the Sum Rule, the derivative of $6 x + 1$ with respect to $x$ is $\frac{d}{d x} [6 x] + \frac{d}{d x} [1]$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} (\frac{d}{d x} [6 x] + \frac{d}{d x} [1]))}{{(6 x + 1)}^{6}}$

Step 3.4.3

Since $6$ is constant with respect to $x$ , the derivative of $6 x$ with respect to $x$ is $6 \frac{d}{d x} [x]$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} (6 \frac{d}{d x} [x] + \frac{d}{d x} [1]))}{{(6 x + 1)}^{6}}$

Step 3.4.4

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

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} (6 \cdot 1 + \frac{d}{d x} [1]))}{{(6 x + 1)}^{6}}$

Step 3.4.5

Multiply $6$ by $1$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} (6 + \frac{d}{d x} [1]))}{{(6 x + 1)}^{6}}$

Step 3.4.6

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} (6 + 0))}{{(6 x + 1)}^{6}}$

Step 3.4.7

Simplify the expression.

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Step 3.4.7.1

Add $6$ and $0$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} ({(6 x + 1)}^{2} \cdot 6)}{{(6 x + 1)}^{6}}$

Step 3.4.7.2

Move $6$ to the left of ${(6 x + 1)}^{2}$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 3 x^{4} (6 \cdot {(6 x + 1)}^{2})}{{(6 x + 1)}^{6}}$

Step 3.4.7.3

Multiply $6$ by $- 3$ .

$\frac{4 {(6 x + 1)}^{3} x^{3} - 18 x^{4} {(6 x + 1)}^{2}}{{(6 x + 1)}^{6}}$

Step 3.5

Simplify.

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Step 3.5.1

Simplify the numerator.

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Step 3.5.1.1

Factor $2 {(6 x + 1)}^{2} x^{3}$ out of $4 {(6 x + 1)}^{3} x^{3} - 18 x^{4} {(6 x + 1)}^{2}$ .

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Step 3.5.1.1.1

Factor $2 {(6 x + 1)}^{2} x^{3}$ out of $4 {(6 x + 1)}^{3} x^{3}$ .

$\frac{2 {(6 x + 1)}^{2} x^{3} (2 (6 x + 1)) - 18 x^{4} {(6 x + 1)}^{2}}{{(6 x + 1)}^{6}}$

Step 3.5.1.1.2

Factor $2 {(6 x + 1)}^{2} x^{3}$ out of $- 18 x^{4} {(6 x + 1)}^{2}$ .

$\frac{2 {(6 x + 1)}^{2} x^{3} (2 (6 x + 1)) + 2 {(6 x + 1)}^{2} x^{3} (- 9 x)}{{(6 x + 1)}^{6}}$

Step 3.5.1.1.3

Factor $2 {(6 x + 1)}^{2} x^{3}$ out of $2 {(6 x + 1)}^{2} x^{3} (2 (6 x + 1)) + 2 {(6 x + 1)}^{2} x^{3} (- 9 x)$ .

$\frac{2 {(6 x + 1)}^{2} x^{3} (2 (6 x + 1) - 9 x)}{{(6 x + 1)}^{6}}$

Step 3.5.1.2

Apply the distributive property.

$\frac{2 {(6 x + 1)}^{2} x^{3} (2 (6 x) + 2 \cdot 1 - 9 x)}{{(6 x + 1)}^{6}}$

Step 3.5.1.3

Multiply $6$ by $2$ .

$\frac{2 {(6 x + 1)}^{2} x^{3} (12 x + 2 \cdot 1 - 9 x)}{{(6 x + 1)}^{6}}$

Step 3.5.1.4

Multiply $2$ by $1$ .

$\frac{2 {(6 x + 1)}^{2} x^{3} (12 x + 2 - 9 x)}{{(6 x + 1)}^{6}}$

Step 3.5.1.5

Subtract $9 x$ from $12 x$ .

$\frac{2 {(6 x + 1)}^{2} x^{3} (3 x + 2)}{{(6 x + 1)}^{6}}$

Step 3.5.2

Cancel the common factor of ${(6 x + 1)}^{2}$ and ${(6 x + 1)}^{6}$ .

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Step 3.5.2.1

Factor ${(6 x + 1)}^{2}$ out of $2 {(6 x + 1)}^{2} x^{3} (3 x + 2)$ .

$\frac{{(6 x + 1)}^{2} (2 x^{3} (3 x + 2))}{{(6 x + 1)}^{6}}$

Step 3.5.2.2

Cancel the common factors.

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Step 3.5.2.2.1

Factor ${(6 x + 1)}^{2}$ out of ${(6 x + 1)}^{6}$ .

$\frac{{(6 x + 1)}^{2} (2 x^{3} (3 x + 2))}{{(6 x + 1)}^{2} {(6 x + 1)}^{4}}$

Step 3.5.2.2.2

Cancel the common factor.

$\frac{{(6 x + 1)}^{2} (2 x^{3} (3 x + 2))}{{(6 x + 1)}^{2} {(6 x + 1)}^{4}}$

Step 3.5.2.2.3

Rewrite the expression.

$\frac{2 x^{3} (3 x + 2)}{{(6 x + 1)}^{4}}$

Step 4

Reform the equation by setting the left side equal to the right side.

$y' = \frac{2 x^{3} (3 x + 2)}{{(6 x + 1)}^{4}}$

Step 5

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = \frac{2 x^{3} (3 x + 2)}{{(6 x + 1)}^{4}}$