Question

(x^2 - 4y)(x -4 y^2)=??

Answer 1

X ^3-4x ^ 2y^2-4y ^2+16y ^3

Answer 2

$(x^2 - 4y)(x -4 y^2)=x^2*x-4x^2y^2-4xy-4y*(-4y^2)=x^3-4x^2y^2 \\ \\ -4xy+16y^3$