SOLUTION: how to show X^2+4x+5 is not one -one?

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Question 606718: how to show X^2+4x+5 is not one -one?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
If it were one-to-one, every x would map to exactly one output (or y-value) and vice versa. Since x = 0 and x = 4 yield the same value, 5, the function f(x) = x^2 + 4x + 5 is not one-to-one.

You can also show it by graphing the function.