Question

Решите:
1) 3a(a+2) - (a+3)²
2) 3(y-1)² + 6y
3) 4ab + 2(a-b)²

Answer 1

3a(a+2) - (a+3)²=3a-6a-(a²-6a-a²+6a-9=3a²-a²-9=2a²-9
ответ:2a²-9