Mathematics, 04.08.2019 11:00 annafellows
Add: (3x2 - 5x + 6) + (9 - 8x - 4x2) a) 12x2 - 13x + 2 b) 7x2 + 3x - 3 c) 7x2 - 13x + 15 d) -x2 - 3x + 15 e) -x2 - 13x + 15
Answers: 1
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![=(3-4)x^2-(5+8)x+15\ \ [\because (-)(+)=(-)]\\\\=-x^2-13x+15](/tpl/images/0169/1956/85fb8.png)
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Add: (3x2 - 5x + 6) + (9 - 8x - 4x2) a) 12x2 - 13x + 2 b) 7x2 + 3x - 3 c) 7x2 - 13x + 15 d)...
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