Разделите многочлен \(\displaystyle s^{\,3}+9s^{\,2}+17s+21\) на многочлен \(\displaystyle s+7\) в столбик:

\(\displaystyle -\)	\(\displaystyle \phantom{\,\,}s^{\,3}+9s^{\,2}+17s+21\)				\(\displaystyle s+7\)
	[ ]				[ ]
	\(\displaystyle \phantom{xx}-\)	[ ]
		[ ]
		\(\displaystyle \phantom{ xxx} -\)		[ ]
				[ ]
				\(\displaystyle 0\phantom{x}\)

и запишите разложение:

\(\displaystyle s^{\,3}+9s^{\,2}+17s+21=(s+7)\cdot \big(\)[ ]\(\displaystyle \big).\)