# SAT Math Multiple Choice Practice Question 186: Answer and Explanation

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**Question: 186**

**10.** If x2 + 2ax + a2 = 16, which of the following could be the value of x + a?

A. -8

B. -4

C. -2

D. 2

E. 8

**Correct Answer:** B

**Explanation:**

B. The trick to this problem is to see that x2 + 2ax + a2 can be factored into (x + a)2. Now you can rewrite the equation as (x + a)2 = 16, so you know that x + a has to equal 4 or -4. Choice (B) is the right answer.