Question

if f(X)=xlxl then find f-1(x) can you please explain me the meaning and use of sgn

 

Joshi sir comment

f(x) = x|x|  => f(x) = -x2  for negative real values of x  and f(x) = x2 for positive real values of x

so f-1(x) = -√|x|  for negative real values and = +√|x| for positive real values of x

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