Solve x+7x+12x

$$x + 7 x + 12 x$$

Evaluate

$$20x$$

Solution Steps

Combine x and 7x to get 8x.

$$8x+12x$$

Combine 8x and 12x to get 20x.

$$20x$$

Differentiate w.r.t. x

$$20$$

Steps Using Definition of a Derivative

Combine x and 7x to get 8x.

$$\frac{\mathrm{d}}{\mathrm{d}x}(8x+12x)$$

Combine 8x and 12x to get 20x.

$$\frac{\mathrm{d}}{\mathrm{d}x}(20x)$$

The derivative of ax^{n} is nax^{n-1}.

$$20x^{1-1}$$

Subtract 1 from 1.

$$20x^{0}$$

For any term t except 0, t^{0}=1.

$$20\times 1$$

For any term t, t\times 1=t and 1t=t.

$$20$$