ISEE Mathematics Achievement Question 313: Answer and Explanation

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Test Information

Question: 313

13. The product of b and a2 can be written as

  • A. (ab)2
  • B.
  • C. 2a × b
  • D.

Correct Answer: D

Explanation:

D This is a Plugging In question because there are variables in the choices. Plug In a value, work through the problem to find a target answer, and then check each of the choices to see which yields the target answer. Let b = 4 and a = 3. Finding the product means multiply, so (4) × 32 = 2 × 9 = 18. The target answer is 18. Now, Plug In your values for b and a into the choices to find the choice that equals your target answer (18). Eliminate (A) since (3 × 4)2 = (12)2 = 144, which is too big. Eliminate (B) since = and is not equal to 18. Also eliminate (C) since 2(3) × (4) 6 × 2 = 12, which does not equal 18. Choice (D) works: = = = 18. Keep it. The correct answer is (D).

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