Respostas

2014-05-22T21:13:59-03:00
X²-3x+2=0 
∆ = b²- 4ac = (-3)² - 4*1*2 = 1 
X =( -b+ - √∆ ) / 2 a
X = (3 + - 1 ) / 2 
X1 = 4/2 = 2 
X2 = 2/2 = 1