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Mathematics
Mathematics
Problem
Define the function
f
f
f
by
f
(
x
)
=
{
x
+
2
,
x
<
1
,
x
2
,
x
≥
1.
f(x)= \begin{cases} x+2, & x<1,\\ x^{2}, & x\ge 1. \end{cases}
f
(
x
)
=
{
x
+
2
,
x
2
,
x
<
1
,
x
≥
1.
Find the set of all preimages of
1
1
1
. a)
{
−
1
}
\{-1\}
{
−
1
}
b)
{
−
1
,
2
}
\{-1,\,2\}
{
−
1
,
2
}
c)
{
−
1
,
1
}
\{-1,1\}
{
−
1
,
1
}
d)
{
1
}
\{1\}
{
1
}
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