1.NounThe set of points that map to a given point (or set of points) under a specified function."Under the function given by
f
(
x
)
=
x
2
{\displaystyle f(x)=x^{2}}
, the inverse image of 4 is
{
−
2
,
2
}
{\displaystyle \{-2,2\}}
, as is the inverse image of
{
4
}
{\displaystyle \{4\}}
."