ISEE Mathematics Achievement Question 85: Answer and Explanation
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Question: 85
1. Which expression is equivalent to the expression (z + 7)(z - 7)
- A. z2 - 49
- B. z2 + 49
- C. z2 - 14z - 49
- D. z2 + 14z - 49
Correct Answer: A
Explanation:
The correct answer is (A). To find the value of this expression, multiply the binomials using the FOIL method. Multiply the first, outer, inner, and last terms:
The -7z and +7z in the middle cancel each other out, and we are left with z2 - 49.