Question

How do I solve this?
Which function has an inverse that is also a function?

g(x) = 2x – 3
k(x) = –9x^2
f(x) = |x + 2|
w(x) = –20

Answer 1

hmm keep in mind that
only one-to-one function have inverse relations that are also functions

to check for a one-to-one function, graph them and run on them the "vertical line test" and the "horizontal line test"

if it passes both, then it has an inverse relation that is also a function

Answer 2

do I just plug in whatever for the x value?

Answer 3

well... are you supposed to graph them to check ?