SOLUTION: Determine whether the function f(x)=x^2-4x has an inverse. I thought yes, that the graph passes the horizontal line test, but maybe it doesn't pass the horizontal test?

Algebra ->  Rational-functions -> SOLUTION: Determine whether the function f(x)=x^2-4x has an inverse. I thought yes, that the graph passes the horizontal line test, but maybe it doesn't pass the horizontal test?      Log On


   



Question 883205: Determine whether the function f(x)=x^2-4x has an inverse.
I thought yes, that the graph passes the horizontal line test, but maybe it doesn't pass the horizontal test?

Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
It doesn't -- f(x) is a parabola pointing upward, so you can draw a horizontal line that passes through two different points on the graph of f(x).