Solve 8a+8a-9a=

$$8 a + 8 a - 9 a =$$

Evaluate

$$7a$$

Solution Steps

Combine 8a and 8a to get 16a.

$$16a-9a$$

Combine 16a and -9a to get 7a.

$$7a$$

Differentiate w.r.t. a

$$7$$

Steps Using Definition of a Derivative

Combine 8a and 8a to get 16a.

$$\frac{\mathrm{d}}{\mathrm{d}a}(16a-9a)$$

Combine 16a and -9a to get 7a.

$$\frac{\mathrm{d}}{\mathrm{d}a}(7a)$$

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

$$7a^{1-1}$$

Subtract 1 from 1.

$$7a^{0}$$

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

$$7\times 1$$

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

$$7$$