Разделите многочлен \(\displaystyle s^{\,4}+3s^{\, 3}-23s^{\,2}+38s+21\) на многочлен \(\displaystyle s+7\) в столбик:

\(\displaystyle -\)	\(\displaystyle \phantom{\,\,}s^{\,4}+3s^{\, 3}-23s^{\,2}+38s+21\)				\(\displaystyle s+7\)
	[ ]				[ ]
	\(\displaystyle \phantom{1} -\)	[ ]
		[ ]
		\(\displaystyle \phantom{ x^{\,3}xx\,} -\)	[ ]
			[ ]
			\(\displaystyle \phantom{ xxxx} -\)	[ ]
				[ ]
				\(\displaystyle 0\,\,\)

Найдите недостающий множитель в разложении:

\(\displaystyle s^{\,4}+3s^{\, 3}-23s^{\,2}+38s+21=(s+7) \cdot (\)[ ]\(\displaystyle ).\)