ISEE Quantitative Comparisons Question 78: Answer and Explanation
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Question: 78
| x = –1 | |
| Column A | Column B |
| x3 + x2 – x + 1 | x3 – x2 + x – 1 |
- A. if the quantity in Column A is greater
- B. if the quantity in Column B is greater
- C. if the quantities are equal
- D. if the relationship cannot be determined from the information given
Correct Answer: A
Explanation:
The correct answer is (A).
x3 + x2 - x + 1 =
(-1) 3 + (-1) 2 - (-1) + 1
= -1 + 1 + 1 + 1
= 2
x3 - x2 + x - 1 =
(-1) 3 - (-1) 2 + (-1) - 1
= -1 -1 -1 -1
= -4
Column A > Column B