Question

49y²-(3-7y)²=
Решите ПЖЖЖЖЖЖЖЖЖЖЖЖЖЖ ​

Answer 1

49у²-(9-42у+49у²) = 49у²-9+42у-49у²= 42у-9

Answer 2

Ответ:

49у²-(3-7у)² = 49у²-(9-42у+49у²) = 49у²-9+42у-49у² = 42у-9