If f : C → C is defined by f(x) = x2, write f–1(–4). Here, C denotes the set of all complex numbers.
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
f(x)=-4
x2=-4
x=2i,-2i