Respostas

2013-11-25T15:37:02-02:00
2013-11-25T16:03:13-02:00
(2x + 3)² = (2x+3) x (2x+3)
4x² + 6x + 6x + 9 =  
4x² + 12x + 9 = 0 (bhaskara)
∆=144-144=0
x'=x" =12/8 = 6/4 = 3/2