Помогите решить! (6а-в) в квадрате - (9а-в) (4а+2в)
(6а-в)²-(9а-в)(4а+2в)=36а²-12ав+в²-(36а²+18ав-4ав-2в²)=36а²-12ав+в²-36а²-18ав+4ав+2в²=-26ав+3в²=3в²-26ав