Digital PSAT Math Practice Question 253: Answer and Explanation

Question: 253

Which of the following is an equivalent form of

• A. x² - 1
• B. 49x² + 7
• C. 7(x² - 1)
• D.

Correct Answer: C

Explanation:

(C) First, you can factor a 7 out of both factors of the numerator:

One 7 in the numerator will cancel out with the 7 in the denominator, leaving you with 7(x - 1)(x + 1). Next, FOIL the terms in the parentheses to get 7(x² - 1), answer (C).