Question

(0.5×^2+0.4y^2)(0.5×^2-0.4y)^2​

Answer 1

0.5x^2(0.5x^2-0.4y^2)+0.4y^2(0.5x^2-0.4y^2)

0.25x^4-0.20x^2y^2+0.20x^2y^2-0.16y^4

0.25x^4-0.16y^4