Let R denote the set of all real numbers and f:R-->R be a function defined by f(x)=x^2. if A = x belong to R :x<0 then f^-1 (A) equals

Answers (1)

Solution:    f^-1(A)=xin R^+:f(x )in A,

                    f^-1(A)=x in R:f(x)< 0 .=x in R:x^2< 0=Phi .

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