SOLUTION: 6. (-5x^3 + 2y^3) - (15x^3 - 7x^2y + 8xy^2 - 4y^3)
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Question 171345: 6. (-5x^3 + 2y^3) - (15x^3 - 7x^2y + 8xy^2 - 4y^3)
Answer by KnightOwlTutor(293) (Show Source): You can put this solution on YOUR website!
(-5x^3 + 2y^3) - (15x^3 - 7x^2y + 8xy^2 - 4y^3)
I would change the sign of all the terms after the negative sign
- (15x^3 - 7x^2y + 8xy^2 - 4y^3)=(-15x^3+7x^2y-8xy^2+4y^3)
Then I would combine like signs.
(-5-15)x^3+7x^2y-8xy^2+(2+4)y^3=-20x^3+7x^2y-8xy^2+6y^3
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