Respostas

2014-04-15T13:07:10-03:00
(3x - 5y)² =
(3x - 5y)(3x - 5y) =
9x² - 15xy - 15xy + 25y² =
9x² - 30xy + 25y²
1 5 1
2014-04-15T14:28:00-03:00
(3x - 5y)² =
(3x - 5y)(3x - 5y) =
9x² - 15xy - 15xy + 25y² =
9x² - 30xy + 25y²
2 5 2