One-to-one functions?

Question

Is the function f(x)=3.3+1.6x-2.5x^3 a one-to-one function? Why? If so, what is its inverse?

Answer 1

No it is many-one function

Vertical line cuts once

Horizontal line cuts many

Answer 2

Do you know that "one-to-one" ness of any function depends on the domain? What's the domain.

See, sinx is one-to-one on[ -pi/2, pi/2] but not for all reals.

How can you expect us to slove an incomplete problem?

And "vertical and horizontal  lines" will be meaningful only on earth. But "one-to-one"ness is absolute not relative.