solve by simple division method x^3+5x^2-6 by x+2
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(x+2) | x^3 + 5x^2 + 0x -6 | (x^2 + 3x -3)
x^3 + 2x^2
(-)__(-)_____________
3x^2 + 0x - 6
3x^2 + 3x + 0
_____(-)___(-)__(-)____
-3x - 6
-3x - 6
_________(+)__(+)____
0. 0
so, the ans will (x^2 + 3x -3)
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