Calculus Examples

$y = (3 x^{2} - 4 x + 1) (5 - 6 x^{2})$

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 $f (x) = 3 x^{2} - 4 x + 1$ and $g (x) = 5 - 6 x^{2}$ .

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

Step 2

Differentiate.

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Step 2.1

By the Sum Rule, the derivative of $5 - 6 x^{2}$ with respect to $x$ is $\frac{d}{d x} [5] + \frac{d}{d x} [- 6 x^{2}]$ .

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

Step 2.2

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

$(3 x^{2} - 4 x + 1) (0 + \frac{d}{d x} [- 6 x^{2}]) + (5 - 6 x^{2}) \frac{d}{d x} [3 x^{2} - 4 x + 1]$

Step 2.3

Add $0$ and $\frac{d}{d x} [- 6 x^{2}]$ .

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

Step 2.4

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x^{2}$ with respect to $x$ is $- 6 \frac{d}{d x} [x^{2}]$ .

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

Step 2.5

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

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

Step 2.6

Multiply $2$ by $- 6$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) \frac{d}{d x} [3 x^{2} - 4 x + 1]$

Step 2.7

By the Sum Rule, the derivative of $3 x^{2} - 4 x + 1$ with respect to $x$ is $\frac{d}{d x} [3 x^{2}] + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [1]$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (\frac{d}{d x} [3 x^{2}] + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [1])$

Step 2.8

Since $3$ is constant with respect to $x$ , the derivative of $3 x^{2}$ with respect to $x$ is $3 \frac{d}{d x} [x^{2}]$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (3 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [1])$

Step 2.9

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

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (3 (2 x) + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [1])$

Step 2.10

Multiply $2$ by $3$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (6 x + \frac{d}{d x} [- 4 x] + \frac{d}{d x} [1])$

Step 2.11

Since $- 4$ is constant with respect to $x$ , the derivative of $- 4 x$ with respect to $x$ is $- 4 \frac{d}{d x} [x]$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (6 x - 4 \frac{d}{d x} [x] + \frac{d}{d x} [1])$

Step 2.12

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

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (6 x - 4 \cdot 1 + \frac{d}{d x} [1])$

Step 2.13

Multiply $- 4$ by $1$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (6 x - 4 + \frac{d}{d x} [1])$

Step 2.14

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

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (6 x - 4 + 0)$

Step 2.15

Add $6 x - 4$ and $0$ .

$(3 x^{2} - 4 x + 1) (- 12 x) + (5 - 6 x^{2}) (6 x - 4)$

Step 3

Simplify.

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Step 3.1

Apply the distributive property.

$3 x^{2} (- 12 x) - 4 x (- 12 x) + 1 (- 12 x) + (5 - 6 x^{2}) (6 x - 4)$

Step 3.2

Apply the distributive property.

$3 x^{2} (- 12 x) - 4 x (- 12 x) + 1 (- 12 x) + (5 - 6 x^{2}) (6 x) + (5 - 6 x^{2}) \cdot - 4$

Step 3.3

Apply the distributive property.

$3 x^{2} (- 12 x) - 4 x (- 12 x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + (5 - 6 x^{2}) \cdot - 4$

Step 3.4

Apply the distributive property.

$3 x^{2} (- 12 x) - 4 x (- 12 x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5

Combine terms.

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Step 3.5.1

Multiply $- 12$ by $3$ .

$- 36 x^{2} x - 4 x (- 12 x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.2

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

$- 36 (x^{1} x^{2}) - 4 x (- 12 x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.3

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

$- 36 x^{1 + 2} - 4 x (- 12 x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.4

Add $1$ and $2$ .

$- 36 x^{3} - 4 x (- 12 x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.5

Multiply $- 12$ by $- 4$ .

$- 36 x^{3} + 48 x \cdot x + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.6

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

$- 36 x^{3} + 48 (x^{1} x) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.7

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

$- 36 x^{3} + 48 (x^{1} x^{1}) + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.8

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

$- 36 x^{3} + 48 x^{1 + 1} + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.9

Add $1$ and $1$ .

$- 36 x^{3} + 48 x^{2} + 1 (- 12 x) + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.10

Multiply $- 12$ by $1$ .

$- 36 x^{3} + 48 x^{2} - 12 x + 5 (6 x) - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.11

Multiply $6$ by $5$ .

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 6 x^{2} (6 x) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.12

Multiply $6$ by $- 6$ .

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 36 x^{2} x + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.13

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

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 36 (x^{1} x^{2}) + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.14

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

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 36 x^{1 + 2} + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.15

Add $1$ and $2$ .

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 36 x^{3} + 5 \cdot - 4 - 6 x^{2} \cdot - 4$

Step 3.5.16

Multiply $5$ by $- 4$ .

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 36 x^{3} - 20 - 6 x^{2} \cdot - 4$

Step 3.5.17

Multiply $- 4$ by $- 6$ .

$- 36 x^{3} + 48 x^{2} - 12 x + 30 x - 36 x^{3} - 20 + 24 x^{2}$

Step 3.5.18

Add $- 12 x$ and $30 x$ .

$- 36 x^{3} + 48 x^{2} + 18 x - 36 x^{3} - 20 + 24 x^{2}$

Step 3.5.19

Subtract $36 x^{3}$ from $- 36 x^{3}$ .

$- 72 x^{3} + 48 x^{2} + 18 x - 20 + 24 x^{2}$

Step 3.5.20

Add $48 x^{2}$ and $24 x^{2}$ .

$- 72 x^{3} + 72 x^{2} + 18 x - 20$