Question 65986
(x+2y^2)(x-4y)

F- x*x
 = x^2

O - x*(-4y)
  = -4xy

I - 2y^2 * x
  = 2xy^2

L - 2y^2*(-4y)
  = -8y^3

Thus (x+2y^2)(x-4y)

    = x^2 - 4xy + 2xy^2 - 8y^3


Good luck!!!