Example1:
Determinewhetherthe functionsare one-to-one:(a) (b)
Solution:
It is best to graphboth functionsand drawon eacha horizontalline. As you can see fromthe graphs,
is not one-to-onesincethe horizontalline intersectsit at two points.The function
however, is indeedone-to-onesinceonly one pointis intersectedby the horizontalline.