Question

If f(x) is a function and f(1) = 5, then which of the following could NOT be true?

A. f(1) = 1
B. f(2) = 1
C. f(5) = 5

Answer 1

f(1) = 1 is not possible here

Explanation:

f(1) = 1 could NOT be true, because for each input to a function, there is ONLY one output.

Cannot have both f(1) = 1 and f(1) = 5.