Роздiл 3. Одночлени i многочлени » 589 (8)

8) (2x – 6)2 – (5х + 1)2 = 0; (2x – 6 – 5x – 1)(2x – 6 + 5x + 1) = 0; (–3x – 7)(7x – 5) = 0; 3x + 7 = 0; 3x = –7; x = –21/3; 7x – 5 = 0; 7x = 5; x = 5/7.