Calculus Examples

$f (x) = (3 x^{2} + 7) (x^{2} - 2 x + 3)$

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

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

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

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

Step 2.3

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

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

Step 2.4

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

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

Step 2.5

Multiply $- 2$ by $1$ .

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

Step 2.6

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

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

Step 2.7

Add $2 x - 2$ and $0$ .

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

Step 2.8

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

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

Step 2.9

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

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

Step 2.10

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

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

Step 2.11

Multiply $2$ by $3$ .

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

Step 2.12

Since $7$ is constant with respect to $x$ , the derivative of $7$ with respect to $x$ is $0$ .

$(3 x^{2} + 7) (2 x - 2) + (x^{2} - 2 x + 3) (6 x + 0)$

Step 2.13

Simplify the expression.

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Step 2.13.1

Add $6 x$ and $0$ .

$(3 x^{2} + 7) (2 x - 2) + (x^{2} - 2 x + 3) (6 x)$

Step 2.13.2

Move $6$ to the left of $x^{2} - 2 x + 3$ .

$(3 x^{2} + 7) (2 x - 2) + 6 \cdot (x^{2} - 2 x + 3) x$

Step 3

Simplify.

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Step 3.1