Digital PSAT Math Practice Question 163: Answer and Explanation

Question: 163

What is the value of the constant c in the equation below?

• A. -4
• B. 0
• C. 4
• D. 16

Correct Answer: A

Explanation:

(A) Use FOIL on both sides to get:

The coefficients of like terms of both sides of the equation must equal one another. The coefficients of the x²-terms and of the x-terms are already equal on both sides. However, the constant terms must equal one another as well:

Subtract 64 from both sides:

Choice (A) is correct.