Question

Determine if the function is one to one

Answer 1

\[f(x) = x^2 - 2x\]

Answer 2

Function is not one-to-one because there exist values such that f(a) = f(b) where a =/= b

For example:
f(-1) equals 3
but
f(3) also equals 3
so f is not one-to-one