Question

How do you simplify `x^5y + x^4y^2 - 3x^5y + 9x^4y^2 - 2x^4y^2`?

Answer 1

Rearranging we can write
`=(x^5y-3x^5y)+(x^4y^2+9x^4y^2-2x^4y^2)=-2x^5y+8x^4y^2`