d - 30 d + 30 - 7 = - 7 What is a solution to the given equation?

Question

Accepted Answer

The correct answer is either - 30 or 30 . Adding 7 to each side of the given equation yields d - 30 d + 30 = 0 . Since a product of two factors is equal to 0 if and only if at least one of the factors is 0 , either d - 30 = 0 or d + 30 = 0 . Adding 30 to each side of the equation d - 30 = 0 yields d = 30 . Subtracting 30 from each side of the equation d + 30 = 0 yields d = - 30 . Therefore, the solutions to the given equation are - 30 and 30 . Note that -30 and 30 are examples of ways to enter a correct answer.

Question 750808