Вправи: 1084

1084. Спростіть вираз:

1) (5m –2)(5m + 2) – m(10m – 1) + (m – 12)² = 25m² – 4 – 10m² + m + m² – m + 14 = 16m² – 334;

2) (a + 4y)² – (a – 2y)(a + 2y) – y(4a – 5y) = a² + 8ay + 16у² – a² +

+ 4y² – 4ay + 5y² = 25y² + 4ay.