Respostas

2013-09-18T21:24:47-03:00


x² - 6x + 9 = 0

a=1 b= -6 c= 9

Δ = b²-4.a.c
Δ = (-6)²-4.1.9 
Δ = 36-36 
Δ = 0

x = -b ± √Δ / 2.a
x = - (-6) ± √0 / 2. (1)
x = + 6 ± 0 / 2

x¹ = 6 + 0 / 2
x¹ = 6 / 2
x¹ = 3

x² = 6 - 0 / 2
x² = 6 / 2
x² = 3

S = {3}