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Question

Find the values of c that satisfy the Rolle's theorem for integrals on [−1,3].
f(x)=x2−2x−8

A
c=3
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B
c=1
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C
c=0
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D
c=2
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Solution

The correct option is B c=1
Given : f(x)=x22x8(1,3)
Rolles's theorem : f(c)=f(b)f(a)(ba)
(2c2)=f(3)f(1)(3(1))=(968)(1+28)(4)=02c2=0c=1
Hence the correct answer is c=1

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