PSAT Math Multiple-Choice Question 688: Answer and Explanation
Question: 688
Based on the graph of f(x) below, f(x) is divisible by which of the following expressions?
I. x - 4
II. x + 1
III. x + 3
- A. I and II only
- B. I and III only
- C. All of the above
- D. None of the above
Correct Answer: B
Explanation:
(B) From the graph, the function has zeros at x = -3 and at x = 4.
Starting with the x = -3, add 3 to both sides:
x + 3 = 0
Therefore, x + 3 is a factor. This means that the function must be divisible by x + 3.
Similarly, x = 4, so:
x - 4 = 0
Therefore, x - 4 is a factor of the function, meaning the function is divisible by x - 4. These are the only two zeros. So the function has only two distinct factors, which we have already found. Therefore, Options I and III are correct, which is choice (B).
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