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Q.

Let  f:ℝ→ℝ be given by fx=x−1x−2x−5  Define Fx=∫0xftdt,x>0   Then when of the following options is/are correct?

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a

F has a local minimum at x = 1

b

Fx≠0 for all x∈0,5

c

F has a local maximum at x = 2

d

F has two local maxima and one local minimum in 0,∞

answer is A.

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Detailed Solution

F1(x)=f(x)=(x-1)(x-2)(x-5) At x=1 and x=5  F(x) has local minima  At x=2,F(x) has local maxima and F(x)<0∀x∈(0,5)       since F x has local maximum at x=2 and maximum mavalue F2=∫02x-1x-2x-5dx<0  fx  graph is    The graph of F(x) is
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