Factor by grouping.
-$$s ^ { 2 } + 4 s + 9 s + 36$$
A) $( \mathrm { s } + 4 ) ( \mathrm { s } - 9 )$
B) $s ( s + 49 )$
C) $( s - 4 ) ( s - 9 )$
D) $( s + 4 ) ( s + 9 )$

Name: Factor by grouping. -\[s ^ { 2 } + 4 s + 9 s + 36\] A) $( \mathrm { s } + 4 ) ( \mathrm { s } - 9 )$ B) $s ( s + 49 )$ C) $( s - 4 ) ( s - 9 )$ D) $( s + 4 ) ( s + 9 )$
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Question

Quizplus · Accepted Answer

First, group the terms: $s^2 + 4s$ and $9s + 36$. Factoring each group gives $s(s + 4)$ and $9(s + 4)$. Combining these gives $(s + 4)(s + 9)$.

Factor by Grouping s2+4s+9s+36s ^ { 2 } + 4 s + 9 s + 36s2+4s+9s+36

Factor by Grouping $s ^ { 2 } + 4 s + 9 s + 36$