ISEE Word Problems Question 273: Answer and Explanation
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Question: 273
7. What is the value of (x + 4)(x – 5)?
- A. x2 – 1
- B. x2 – 20
- C. x2 – x – 20
- D. x2 + x – 20
Correct Answer: C
Explanation:
C
Use FOIL (First, Outside, Inside, Last) on the two factors: (x + 4)(x – 5) = (x2 + 4x– 5x – 20). Combine like terms: x2 – x – 20.
Plug in a number for x, such as x = 6, and solve: (6 + 4)(6 – 5) = (10)(1) = 10. Only choice (C) yields 10 when the value for x is plugged in.