5. Continuity and Differentiation
medium

જો વિધેય $f(x) =2x^3 + bx^2 + cx, x \in [-1, 1],$ એ બિંદુ $x = \frac {1}{2}$ આગળ રોલના પ્રમેયનું પાલન કરે તો $2b+ c=$

A

$-3$

B

$-1$

C

$2$

D

$1$

(JEE MAIN-2015)

Solution

Conduction for Rolls theorem

$f(1)=f(-1)$

and $f^{\prime}\left(\frac{1}{2}\right)=0$

$c=-2$ and $b=\frac{1}{2}$

$2 b+c=-1$

Standard 12
Mathematics

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