SAT Math Multiple Choice Practice Question 57: Answer and Explanation

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Question: 57


The number of solutions to f(x) = 0 is

A. 0
B. 1
C. 2
D. 3
E. It cannot be determined from the graph alone.

Correct Answer: D


D. When f(x) = 0, the graph has a height of 0; in other words, it crosses the x-axis. As you can see from the graph, it crosses the x-axis in three places. Notice that you don't actually need to know where it crosses the x-axis. You just need to count the number of times it does so.

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