Digital PSAT Math Practice Question 212: Answer and Explanation

Question: 212

Which of the following could be a value of x in this equation?

8x² = -16x - 2

I.

II.

III.

• A. I only
• B. II only
• C. I and III only
• D. II and III only

Correct Answer: C

Explanation:

(C) Which of the following could be a value of x in this equation?

Complete the square:

Use the quadratic equation to find the answers:

Then, simplify the two ± solutions to see what they equal:

And .