Question

Which function has an inverse that is a function?

b(x) = x2 + 3
d(x) = -9
m(x) = -7x
p(x) = 1x1

Answer 1

Answer is option C.

m(x) = -7x

This is a bijective function.

Here for everyvalue of theres is only one and one unique value of y.

And hence its inverse will also be a function.