Respostas

  • Usuário do Brainly
2014-05-08T15:56:23-03:00
(5x + 2y)² =
(5x + 2y) . (5x + 2y) =
25x² + 10xy + 10xy + 4y² =
25x² + 20xy + 4y²
3 4 3