SOLUTION: Is the given function {{{f(x)=x^2-4}}} one-to-one? Why or why not?

Question 128490: Is the given function one-to-one? Why or why not?

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Notice if we graph , we get

From the graph, we can see that the curve violates the horizontal line test. In other words, if you pass a straightedge horizontally through the graph, the straightedge will touch two points. So the function is not one-to-one.
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