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Q.

If f(x)=x,x≤1x2+bx+cx>1 then find value of b and c. If f(x) is differentiable at x=1

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a

−1,1

b

1,-1

c

1,1

d

0,1

answer is A.

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Detailed Solution

f1x=1         , x<12x+b , x>1f(x) is differentiable at x=1∴f is continuous of x=1Ltx→1+f(x)=Ltx→1-f(x)1+b+c=1⇒b+c=0 Also f11+=f11-Ltf1(x)=Ltf1(x)2+b=1⇒b=-1∴c=1
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