1.(a-4)⁴ 2.(x+3y)³ tolong pake cara

1). (a-4)(a-4)=a^2-8a+16
(a-4)(a-4)=a^2-8a+16
(a^2-8a+16)(a^2-8a+16)=a^4-8a^3+16a^2-8a^3+64a^2-128a+16a^2-128a+256=a^4-16a^3+96a^2-256a+256

2). (x+3y) (x+3y) =x^2+6xy+9y^2
(x^2+6xy+9y^2)(x+3y) =x^3+3x^2y+6x^2y+18xy^2+9xy^2+27y^3=x^3+9x^2y+27xy^2+27y^3