Posted by **don** on Friday, March 16, 2012 at 10:00pm.

by applying rolle's theorem, check whether it is possible that the function f(x) = x^5 + x -17 has two real roots. your reason is that if f(x) has two real roots then by rolle's theorem, f'(x) must be equal to what at certain value of x between these two roots, but f'(x) is always (negative, positive, zero)?

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