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2013-09-26T14:11:41-03:00
Delta= 2^{2} -4.1.1
delta=4-4
delta=0
x' = [ -b +√Δ ] / 2a
x' = [ -2 +√0 ] / 2.1
x' = [-2 +0] / 2
x' = -2 / 2
x' = -1
 
x'' = [ -b -√Δ ] / 2a
x'' = [ -2 -√0 ] / 2.1
x'' = -2 / 2
x'' =-1

1 5 1
2013-09-26T15:38:21-03:00
X² - 2x + 1 = 0  ==> (x - 1)² ==> x' = x" = 1

1 4 1