Respostas

2014-05-22T19:11:46-03:00
X² - 10x + 25 =0
∆ = b²- 4ac = (-10)² - 4*1*25 = 0
X =( -b+ - √∆ ) / 2 a
X = (10+ 0 ) / 2
X = 10/2
X= 5 
2 5 2