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AFNequation

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## Homework Statement

I have a homework that i couldn't do :( can you explain it to me please ?

the problem is :

find all values of x=c so that the tangent line to the graph of f(x) af (c , f(c)) will be horizontal

http://img13.imageshack.us/img13/4222/scan0002izs.jpg

## The Attempt at a Solution

i know in the end the answer will be x = 2 ... but i want to how did we get it

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