Answer:
2x^3 +7x^2+3x-2
Explanation:
3x^3 +7x^2 -x
- ( x^3 -4x +2)
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The first step is to line up the variables by degree
3x^3 +7x^2 -x
- ( x^3 -4x +2)
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Then distribute the minus sign
3x^3 +7x^2 -x
- x^3 +4x -2
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2x^3 +7x^2+3x-2