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Help Pulez! Are these one-to-one functions?

Help Pulez! Are these one-to-one functions?

On 10/2/00 10:13:26 PM, ginaanto wrote:
>f(x)=(x-5)^2
>
>f(x)=x^2/x+1
>
>f(x)=25-x^2 (-infinity,0]
>
>f(x)= ax+b

The first example is NOT one-to-one since f(4) = f(6) = 1.

The third example IS one-to-one since, when f(x) is restricted to the left-hand x-axis, its graph satisfies the horizontal line test. See the attached image.

I hope that this helps you get started...

Bonnie


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