tolong jawb dong. (-4a+b)(4a+2b

(-4a+b)(4a+2b) =
= (-4a+b)×(4a+2b)
= -4a × 4a -4a × 2b +4ab +b × 2b
= -16a² -8ab + 4ab + 2b²
= -16a² -4ab + 2b²

semoga bermanfaat (≧∇≦)/(●´∀｀●)