Answer :

Formula:-


(i)A function f: X Y is defined to be invertible, if there exists a function g : Y X


such that gof =Ix and fog = Iy. The function g is called the inverse of f and is denoted by f-1


f(x)=y


f-1(y)=x


x2=25


x=-5,5


f-1(25) ={-5,5}


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