PSAT Math Multiple-Choice Practice Question 441

Correct Answer: A

Explanation:

A

Difficulty: Easy

Getting to the Answer: Rearrange the equation first so you can factor 4 out. From there, divide by 4, then factor as usual:

Keep in mind that while z is equal to -10 or 2, the question asks only for the positive value, which is (A). Reading carefully, you could have eliminated (B) before doing any calculations because it includes a negative value.