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1.
a. (2x + 3 y) ( 4x^2- 6xy + 9y^)
= 8 x^3 - 12x^2y + 18 xy^2 + 12 x^2y - 18 xy^2 + 27y^
= - 12x^2y +12x^2y + 18xy^2 - 18 xy^2 + 8 x^3 + 27x^3
=35 x^3
b. (x^n - y^n) (x^n + 2y^n)
=x^2n + 2x^ny^n -x^ny^n - 2y^2n
=x^2n + x^ny^n - 2y^2n
2. (3x^2 - 2y)^4
= 81 x^8 - 24 x^2y + 16y
tolong di teliti lagi ya, mana tau ada yg salah
kalau salah maaf ya.