Respostas

2014-05-19T21:50:43-03:00
2.(-2)² -(-2)y
2.4 +2y
8+2y
1 3 1
2014-05-19T21:54:08-03:00
 2.(-2)² - (-2).y
y= 2. (-4) - (-2)
y = 2. (-6)
y = -12