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Q.

The value of c for which the Lagrange's mean value theorem is applicable for the function 

f(x)=x(x+3)(x-2) in -1, 4 is

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a

2

b

83

c

43

d

-83

answer is C.

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Detailed Solution

f1(x)=x+3x-2+xx-2+xx+3         =x2+x-6+x2-2x+x2+3x         =3x2+2x-6 f1(c)=f(x)-f(-1)4-(-1) 3c2+2c-6=56-65=10 3c2+2c-16=03c2+8c-6c-16=0                               3c(3c+8)-2(3c+8)=0                               c=2

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