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f(x)=(x-1)(x-2)(x-3), [1,3]

since
\[f(1)=f(3)=0\] and since any polynomial is differentiable you can use rolle

that is where i am stuck, i got that far

use the quadratic formula if it does not factor

if that is too annoying, then cheat
http://www.wolframalpha.com/input/?i=3x^2-12x%2B11%3D0

-b+-sqrt(b^2-4ac)/2a?

yup