Q. 205.0( 1 Vote )

Mark the correct A. increasing

B. decreasing

C. constant

D. none of these

Answer :

Formula:- (i) The necessary and sufficient condition for differentiable function defined on (a,b) to be strictly decreasing on (a, b) is that f’(x)<0 for all x(a,b)


Given:-


f(x)=2(x-1)+3(2-x)


f(x)=-x+4


f’(x)=-1


Therefore f’(x) <0


Hence decreasing function

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