The number of points at which g(x)=11+2f(x) is not differentiable, where f(x)=11+1xis

Since f(x)=11+1x                   =xx+1 is not differentiable at x=0,-1  also g(x)=11+2f(x)=11+2xx+1=11+2x+1x=xx+2x+1=x3x+2 is not differentiable at x=0,-1,-23∴g(x) is not differentiable at 3 points