5
+
8
+
3
+
4
=
−
4
0
+
4
5x+8+3x+4=-40+4
5x+8+3x+4=−40+4
Solve
1
Add the numbers
5
+
8
+
3
+
4
=
−
4
0
+
4
5x+{\color{#c92786}{8}}+3x+{\color{#c92786}{4}}=-40+4
5x+8+3x+4=−40+4
5
+
1
2
+
3
=
−
4
0
+
4
5x+{\color{#c92786}{12}}+3x=-40+4
5x+12+3x=−40+4
2
Combine like terms
3
Add the numbers
4 more steps
Solution
=
−
6
x=-6
x=−6
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That would be choice 3
middle term = -3mn-8mn = -11mn and last term = + 2n^2
