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The function f is defined by f(x) = x3 + 15. What is the value of f (2) ?

Correct answer: C. 23

  • A. 20
  • B. 21
  • C. 23
  • D. 24

Explanation

To find f(2), substitute 2 into the function f(x) = x3 + 15. This gives f(2) = (2)3 + 15. First, calculate the cube of 2, which is 8, and then add 15 to get 23. Therefore, the correct answer is 23.Options A, B, and D are incorrect due to errors in the calculation or misunderstanding the function's expression. Option A might stem from a simple arithmetic error, Option B results from using multiplication instead of exponentiation, and Option D might include an extra addition step.

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About Quantitative Reasoning

Quantitative reasoning applies arithmetic and basic algebra to numerical relationships, including percentages, ratios, averages, fractions, proportions, profit and loss, rates, time, work and measurement. Questions focus on translating words into equations, choosing an efficient method and checking whether the result is numerically reasonable.

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