How would i go about solving this problem?

Attachment 18261

Would i start with f(x) = f(y) ?

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- July 20th 2010, 04:43 PMkensingtonProof that f is injective?
How would i go about solving this problem?

Attachment 18261

Would i start with f(x) = f(y) ? - July 20th 2010, 07:29 PMtonio
- July 20th 2010, 11:53 PMHallsofIvy
Yes, you can start with f(x)= f(y) which, using Tonio's point, immediately gives x= y.