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1. (y-3)*(y+5)
2.(4m+n)*(2n+m)
3.5x2-(x-1)*(x2-2x)
1. (y-3)*(y+5)
2.(4m+n)*(2n+m)
3.5x2-(x-1)*(x2-2x)
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Answers & Comments
1) y^2 +5y - 3y - 15 = y^2 +2y -15
2) 8mn + 4m^2 + 2n^2 +mn = 4m^2 + 9 mn + 2n^2
3) 5x^2 - x^3 + 2x^2 + x^2 - 2x = -x^3 + 8x^2 - 2x