ISEE Word Problems Question 279: Answer and Explanation

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Question: 279

13. What is the value of ?

  • A. 8x6
  • B. 8x18
  • C. 32x6
  • D. 32x18

Correct Answer: B

Explanation:

B

First take the square root of 64: 8. For the variable, you must use the rules of exponents. If the bases are the same, add the exponents when you multiply the terms. The term x36 represents a base of x that was squared, i.e., multiplied by itself. Thus the two exponents added were the same value and produced a sum of 36. (x18)(x18) = x36.

To find the square root, divide the exponent in half. = x18.

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