Which of the following is a solution of x2 + 4x = −8

a. x = −2 − 2i
b. x = 2 + 2i
c. x = −4 + 4i
d. x = 4 − 4i

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.