Respostas

2014-04-29T14:42:41-03:00
9x²+8x-1=0
delta = 8² - 4.9.-1
delta = 64 + 36
delta = 100
x' = (-8 + √100) / 2.9
x' = (-8 + 10)/18
x' = 2/18
x' = 1/9

x" = (-8 - √100) / 2.9
x' = (-8 - 10)/18
x" = -18/18
x" = -1

resp : {1/9 ; -1}