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