PSAT Math Multiple-Choice Question 799: Answer and Explanation
Question: 799
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, use FOIL for the terms in the parentheses to get:
7(x2 - 1)
The answer is choice (C).
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