Respostas

2014-03-17T20:59:37-03:00
Delta = 9² - 4 . 1 . 20 
Delta = 81 -80 
Delta = 1 

x = 9 +- 1/ 2 
x1 = 5 x2 = 4 

m = x1 n = x2 

5 . 4 ( 5 + 4) = 20 . 9 = 180
2 5 2