Solve (-y)(-2y)

$$( - y ) ( - 2 y )$$

Evaluate

$$2y^{2}$$

Solution Steps

Multiply -1 and -2 to get 2.

$$2yy$$

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

$$2y^{2}$$

Differentiate w.r.t. y

$$4y$$

Steps Using Definition of a Derivative

Multiply -1 and -2 to get 2.

$$\frac{\mathrm{d}}{\mathrm{d}y}(2yy)$$

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

$$\frac{\mathrm{d}}{\mathrm{d}y}(2y^{2})$$

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

$$2\times 2y^{2-1}$$

Multiply 2 times 2.

$$4y^{2-1}$$

Subtract 1 from 2.

$$4y^{1}$$

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

$$4y$$