PSAT Math Multiple-Choice Question 770: Answer and Explanation

Question: 770

When x > 0, which of these expressions is equivalent to ?

• A. 4x
• B. 7x
• C. x - 4
• D. x² - 12

Correct Answer: A

Explanation:

(A) Dividing by a fraction is the same as multiplying by its reciprocal:

Therefore:
+ = 2x + 2x = 4x
Choice (A) is the correct answer.