Solve -9a*-2a

$$- 9 a \times - 2 a$$

Evaluate

$$18a^{2}$$

Solution Steps

Multiply a and a to get a^{2}.

$$-9a^{2}\left(-2\right)$$

Multiply -9 and -2 to get 18.

$$18a^{2}$$

Differentiate w.r.t. a

$$36a$$

Steps Using Definition of a Derivative

Multiply a and a to get a^{2}.

$$\frac{\mathrm{d}}{\mathrm{d}a}(-9a^{2}\left(-2\right))$$

Multiply -9 and -2 to get 18.

$$\frac{\mathrm{d}}{\mathrm{d}a}(18a^{2})$$

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

$$2\times 18a^{2-1}$$

Multiply 2 times 18.

$$36a^{2-1}$$

Subtract 1 from 2.

$$36a^{1}$$

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

$$36a$$