Digital PSAT Math Practice Question 116: Answer and Explanation
Question: 116
How many distinct zeros does the function f (x) = (x - 3)(x + 7)(x - 3) have?
- A. 0
- B. 1
- C. 2
- D. 3
Correct Answer: C
Explanation:
(C) The zeros of a factored polynomial can be found by setting each distinct factor equal to 0 and solving for x. Here there are only 2 distinct factors, (x - 3) and (x + 7). So there will only be 2, choice (C).
Note: Although x - 3 occurs twice as a factor, this still corresponds to only one zero. We say that 3 is a zero of multiplicity 2 since its corresponding factor occurs twice.
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