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Question

The value of c, for which the function f(x)=x2+2x8,xϵ[4,2] satisfies Rolle’s theorem, is


A

1

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B

2

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C

-1

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D

-2

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Solution

The correct option is C

-1


f’(x) = 0 2x + 2 = 0 x = – 1

c=1


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