=-x^2 +3x +5 - (6x^2 -5x -1)
=-x^2 +3x +5 -6x^2 +5x +1
=-x^2 -6x^2 +3x +5x +5+1
= -7x^2 +8x +6
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Verified answer
6x²-5x-1-x²+3x+5
_______-
7x²-8x-6
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=-x^2 +3x +5 - (6x^2 -5x -1)
=-x^2 +3x +5 -6x^2 +5x +1
=-x^2 -6x^2 +3x +5x +5+1
= -7x^2 +8x +6