Explicación paso a paso:
A) x³-4x²-x+6+2x²+8x-3
x³-2x²+7x+3
B) (2x²+8x-3)-(x³-4x²-x+6)
2x² +8x -3 -x³ +4x² +x -6
-x³+6x²+9x-9
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Explicación paso a paso:
A) x³-4x²-x+6+2x²+8x-3
x³-2x²+7x+3
B) (2x²+8x-3)-(x³-4x²-x+6)
2x² +8x -3 -x³ +4x² +x -6
-x³+6x²+9x-9