SOLUTION: 6. (-5x^3 + 2y^3) - (15x^3 - 7x^2y + 8xy^2 - 4y^3)

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 6. (-5x^3 + 2y^3) - (15x^3 - 7x^2y + 8xy^2 - 4y^3)       Log On


   

Question 171345: 6. (-5x^3 + 2y^3) - (15x^3 - 7x^2y + 8xy^2 - 4y^3)
Answer by KnightOwlTutor(293) About Me  (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