Evaluate
−
2
x
2
−
y
3
\displaystyle -{2}{x}^{{2}}-{y}^{{3}}
−
2
x
2
−
y
3
when
x
=
−
5
\displaystyle {x}=-{5}
x
=
−
5
and
y
=
2
\displaystyle {y}={2}
y
=
2
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