(18y-15)x (18y-15)= Tolong bantu yh

(a-b)² = a²-2ab+b² , 
(18y-15)² = (18y)² - 2(18yx15) + 15² =324y² – 2(270y) + 225 = 324y² – 540y + 225 = 36y² – 60y + 25