Given the function
f
(
x
)
=
{
4
x
+
9
x
<
0
4
x
+
18
x
≥
0
\displaystyle {f{{\left({x}\right)}}}={\left\lbrace\begin{array}{cc} {4}{x}+{9}&{x}<{0}\\{4}{x}+{18}&{x}\geq{0}\end{array}\right.}
f
(
x
)
=
{
4
x
+
9
4
x
+
18
x
<
0
x
≥
0
Calculate the following values:
f
(
−
1
)
=
\displaystyle {f{{\left(-{1}\right)}}}=
f
(
−
1
)
=
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Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity