Divide. If there is a remainder, express it in the form
r
x
−
4
\displaystyle \frac{{r}}{{{x}-{4}}}
x
−
4
r
.
(
x
3
−
10
x
2
+
21
x
+
12
)
÷
(
x
−
4
)
\displaystyle {\left({x}^{{3}}-{10}{x}^{{2}}+{21}{x}+{12}\right)}\div{\left({x}-{4}\right)}
(
x
3
−
10
x
2
+
21
x
+
12
)
÷
(
x
−
4
)
=
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