SAT Math Multiple Choice Question 711: Answer and Explanation

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Question: 711

6. Let function f(x) be defined by the equation f(x) =x2 - 1. If b is a positive real number, then Images

  • A. Images
  • B. Images
  • C. Images
  • D. Images

Correct Answer: B

Explanation:

B

Advanced Mathematics (functions) MEDIUM-HARD

f(x) = x2 - 1

Substitute Images:

Images

Simplify:

Images

Get common denominator:

Images

Subtract fractions:

Images

Factor numerator:

Images

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