2(x-2y)kuadrat-4x(x-2y)=

Bab Persamaan Kuadrat
Matematika SMP Kelas VIII

2(x - 2y) - 4x (x -2y)
= 2x - 2 . 2y - 4x . x + 4x . 2y
= 2x - 4y - 4x² + 8xy
= -4x² + 8xy + 2x - 4y

2(x-2y)^2 - 4x(x-2y)
= 2(x^2 - 4xy + 4y^2) - 4x^2 + 8xy
=2x^2 - 8xy + 8y^2 - 4x^2 + 8xy
= -2x^2 + 8y^2

^ = pangkat