Determine whether or not the function is one to one

Question

f(x)=2x^3-7

Answer 1

Hi Ralph,

 

Less technical way to find whether a function f(x) is one-to-one is checking whether a horizontal line intersects the graph of f(x) at more than one point. If it does, then f(x) is not one-to-one.

You can use a graph calculator for plotting f(x) = 2x^3 - 7. You will see that it is one-to-one.