Given
f
(
x
,
y
)
=
80
x
+
60
y
−
4
x
2
−
5
y
2
−
x
y
\displaystyle {f{{\left({x},{y}\right)}}}={80}{x}+{60}{y}-{4}{x}^{{2}}-{5}{y}^{{2}}-{x}{y}
f
(
x
,
y
)
=
80
x
+
60
y
−
4
x
2
−
5
y
2
−
x
y
Evaluate
f
(
5
,
8
)
\displaystyle {f{{\left({5},{8}\right)}}}
f
(
5
,
8
)
f
(
5
,
8
)
\displaystyle {f{{\left({5},{8}\right)}}}
f
(
5
,
8
)
=
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\displaystyle
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