Respostas

2013-10-09T18:56:44-03:00
4x-4x+5
a= 4 , b= -4 , c=5

delta = b² - 4ac
delta = (-4)² - 4.4.5
delta = 16 – 80
delta = - 64 (.-1)
delta = 64

x = -b +\- 
√delta / 2a

x= -(-4) +/- √64 / 2.4

x= 4 +/- 8/ 8

x1 = 4 + 8 / 8 =  1,5
x2 = 4 - 8 / 8 = -0,5