FOIL, algebra 1. just one problem, please help?

- 2 x² y^4 + 4 x y^5

This becomes:
-2x^2y^4 + 4xy^5

-y^3(2x^2y - 4xy^2) =

-2x^2y^4 + 4xy^5

(x+4)(x+4)(x+4) foil the 1st 2 jointly to get: x^2 +8x +sixteen then multiply that with x+4 (x+4)(x^2 +8x +sixteen) first multiply the x to the 2nd area, then the 4: x^3 +8x^2 +16x+4x^2 +32x+sixty 4 finally ends up being: x^3+12x^2+48x+sixty 4 desire this is clever

-y^3(2x^2y - 4xy^2)
= -2x^2y^4 + 4xy^5

solve it then combine like terms and youll have it its pretty easy

-y^3(2x^2y - 4xy^2) This is not FOIL, but the expansion is:

-2(x^2)(y^4)+4x(y^5)
or to put the positive term first:

4x(y^5)-2(x^2)(y^4)