Question

What are the zeros of f(x) = x(x – 8)?

A. x = 0 and x = 8
B. x = 0 and x = –8
C. x = 0 only
D. x = 8 only

Answer 1

f(x) will = 0 when either x = 0 or x = 8. Here's how you know.
if x = 0 then 0 * (x - 8) = 0 because anything multiplied by 0 is zero.

if x = 8 then 8 * (8 - 8) = 8 * 0 = 0

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