find the sum of the following expressions show your solution
1.
2a \: + \: 3a \: + 7a \: + \: a =2a+3a+7a+a=
2.
( - 2y \: - 4) \: (5y \: + \: 6) =(−2y−4)(5y+6)=
3.
\begin{gathered}6a {}^{3} - 5a {}^{2} b - 4b {}^{2} \\ - 5a {}^{3} + 6a {}^{2} b + 8b {}^{2} \end{gathered}
6a
3
−5a
2
b−4b
2
−5a
3
+6a
2
b+8b
2
4.
(5b + 8m) + ( - 3b - \: 12m)(5b+8m)+(−3b−12m)
1.
2a \: + \: 3a \: + 7a \: + \: a =2a+3a+7a+a=
2.
( - 2y \: - 4) \: (5y \: + \: 6) =(−2y−4)(5y+6)=
3.
\begin{gathered}6a {}^{3} - 5a {}^{2} b - 4b {}^{2} \\ - 5a {}^{3} + 6a {}^{2} b + 8b {}^{2} \end{gathered}
6a
3
−5a
2
b−4b
2
−5a
3
+6a
2
b+8b
2
4.
(5b + 8m) + ( - 3b - \: 12m)(5b+8m)+(−3b−12m)
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