Evaluate
−
3
x
2
+
8
x
+
7
\displaystyle \frac{{-{3}{x}^{{2}}+{8}}}{{{x}+{7}}}
x
+
7
−
3
x
2
+
8
when
x
=
−
7
\displaystyle {x}=-{7}
x
=
−
7
, or choose undefined if the expression is not defined at
x
=
−
7
\displaystyle {x}=-{7}
x
=
−
7
.
When
x
=
−
7
\displaystyle {x}=-{7}
x
=
−
7
then
−
3
x
2
+
8
x
+
7
=
\displaystyle \frac{{-{3}{x}^{{2}}+{8}}}{{{x}+{7}}}=
x
+
7
−
3
x
2
+
8
=
When
x
=
−
7
\displaystyle {x}=-{7}
x
=
−
7
then
−
3
x
2
+
8
x
+
7
\displaystyle \frac{{-{3}{x}^{{2}}+{8}}}{{{x}+{7}}}
x
+
7
−
3
x
2
+
8
is undefined.
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