Calculus Examples

$y = {(5 x - 3)}^{4} {(6 x + 7)}^{2}$

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 $f (x) = {(5 x - 3)}^{4}$ and $g (x) = {(6 x + 7)}^{2}$ .

${(5 x - 3)}^{4} \frac{d}{d x} [{(6 x + 7)}^{2}] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 2

Rewrite ${(6 x + 7)}^{2}$ as $(6 x + 7) (6 x + 7)$ .

${(5 x - 3)}^{4} \frac{d}{d x} [(6 x + 7) (6 x + 7)] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 3

Expand $(6 x + 7) (6 x + 7)$ using the FOIL Method.

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Step 3.1

Apply the distributive property.

${(5 x - 3)}^{4} \frac{d}{d x} [6 x (6 x + 7) + 7 (6 x + 7)] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 3.2

Apply the distributive property.

${(5 x - 3)}^{4} \frac{d}{d x} [6 x (6 x) + 6 x \cdot 7 + 7 (6 x + 7)] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 3.3

Apply the distributive property.

${(5 x - 3)}^{4} \frac{d}{d x} [6 x (6 x) + 6 x \cdot 7 + 7 (6 x) + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4

Simplify and combine like terms.

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Step 4.1

Simplify each term.

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Step 4.1.1

Rewrite using the commutative property of multiplication.

${(5 x - 3)}^{4} \frac{d}{d x} [6 \cdot 6 x \cdot x + 6 x \cdot 7 + 7 (6 x) + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.1.2

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

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Step 4.1.2.1

Move $x$ .

${(5 x - 3)}^{4} \frac{d}{d x} [6 \cdot 6 (x \cdot x) + 6 x \cdot 7 + 7 (6 x) + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.1.2.2

Multiply $x$ by $x$ .

${(5 x - 3)}^{4} \frac{d}{d x} [6 \cdot 6 x^{2} + 6 x \cdot 7 + 7 (6 x) + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.1.3

Multiply $6$ by $6$ .

${(5 x - 3)}^{4} \frac{d}{d x} [36 x^{2} + 6 x \cdot 7 + 7 (6 x) + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.1.4

Multiply $7$ by $6$ .

${(5 x - 3)}^{4} \frac{d}{d x} [36 x^{2} + 42 x + 7 (6 x) + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.1.5

Multiply $6$ by $7$ .

${(5 x - 3)}^{4} \frac{d}{d x} [36 x^{2} + 42 x + 42 x + 7 \cdot 7] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.1.6

Multiply $7$ by $7$ .

${(5 x - 3)}^{4} \frac{d}{d x} [36 x^{2} + 42 x + 42 x + 49] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 4.2

Add $42 x$ and $42 x$ .

${(5 x - 3)}^{4} \frac{d}{d x} [36 x^{2} + 84 x + 49] + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5

Differentiate.

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Step 5.1

By the Sum Rule, the derivative of $36 x^{2} + 84 x + 49$ with respect to $x$ is $\frac{d}{d x} [36 x^{2}] + \frac{d}{d x} [84 x] + \frac{d}{d x} [49]$ .

${(5 x - 3)}^{4} (\frac{d}{d x} [36 x^{2}] + \frac{d}{d x} [84 x] + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.2

Since $36$ is constant with respect to $x$ , the derivative of $36 x^{2}$ with respect to $x$ is $36 \frac{d}{d x} [x^{2}]$ .

${(5 x - 3)}^{4} (36 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [84 x] + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.3

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

${(5 x - 3)}^{4} (36 (2 x) + \frac{d}{d x} [84 x] + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.4

Multiply $2$ by $36$ .

${(5 x - 3)}^{4} (72 x + \frac{d}{d x} [84 x] + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.5

Since $84$ is constant with respect to $x$ , the derivative of $84 x$ with respect to $x$ is $84 \frac{d}{d x} [x]$ .

${(5 x - 3)}^{4} (72 x + 84 \frac{d}{d x} [x] + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.6

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

${(5 x - 3)}^{4} (72 x + 84 \cdot 1 + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.7

Multiply $84$ by $1$ .

${(5 x - 3)}^{4} (72 x + 84 + \frac{d}{d x} [49]) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.8

Since $49$ is constant with respect to $x$ , the derivative of $49$ with respect to $x$ is $0$ .

${(5 x - 3)}^{4} (72 x + 84 + 0) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 5.9

Add $72 x + 84$ and $0$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} \frac{d}{d x} [{(5 x - 3)}^{4}]$

Step 6

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{4}$ and $g (x) = 5 x - 3$ .

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Step 6.1

To apply the Chain Rule, set $u$ as $5 x - 3$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (\frac{d}{d u} [u^{4}] \frac{d}{d x} [5 x - 3])$

Step 6.2

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

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 u^{3} \frac{d}{d x} [5 x - 3])$

Step 6.3

Replace all occurrences of $u$ with $5 x - 3$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} \frac{d}{d x} [5 x - 3])$

Step 7

Differentiate.

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Step 7.1

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

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} (\frac{d}{d x} [5 x] + \frac{d}{d x} [- 3]))$

Step 7.2

Since $5$ is constant with respect to $x$ , the derivative of $5 x$ with respect to $x$ is $5 \frac{d}{d x} [x]$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} (5 \frac{d}{d x} [x] + \frac{d}{d x} [- 3]))$

Step 7.3

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

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} (5 \cdot 1 + \frac{d}{d x} [- 3]))$

Step 7.4

Multiply $5$ by $1$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} (5 + \frac{d}{d x} [- 3]))$

Step 7.5

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

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} (5 + 0))$

Step 7.6

Simplify the expression.

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Step 7.6.1

Add $5$ and $0$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (4 {(5 x - 3)}^{3} \cdot 5)$

Step 7.6.2

Multiply $5$ by $4$ .

${(5 x - 3)}^{4} (72 x + 84) + {(6 x + 7)}^{2} (20 {(5 x - 3)}^{3})$

Step 8

Simplify.

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Step 8.1

Move $20$ to the left of ${(6 x + 7)}^{2}$ .

${(5 x - 3)}^{4} (72 x + 84) + 20 \cdot {(6 x + 7)}^{2} {(5 x - 3)}^{3}$

Step 8.2

Factor ${(5 x - 3)}^{3}$ out of ${(5 x - 3)}^{4} (72 x + 84) + 20 {(6 x + 7)}^{2} {(5 x - 3)}^{3}$ .

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Step 8.2.1

Factor ${(5 x - 3)}^{3}$ out of ${(5 x - 3)}^{4} (72 x + 84)$ .

${(5 x - 3)}^{3} ((5 x - 3) (72 x + 84)) + 20 {(6 x + 7)}^{2} {(5 x - 3)}^{3}$

Step 8.2.2

Factor ${(5 x - 3)}^{3}$ out of $20 {(6 x + 7)}^{2} {(5 x - 3)}^{3}$ .

${(5 x - 3)}^{3} ((5 x - 3) (72 x + 84)) + {(5 x - 3)}^{3} (20 {(6 x + 7)}^{2})$

Step 8.2.3

Factor ${(5 x - 3)}^{3}$ out of ${(5 x - 3)}^{3} ((5 x - 3) (72 x + 84)) + {(5 x - 3)}^{3} (20 {(6 x + 7)}^{2})$ .

${(5 x - 3)}^{3} ((5 x - 3) (72 x + 84) + 20 {(6 x + 7)}^{2})$