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2009-09-25T23:34:02+02:00
A)
3x² + 5x + 2 = 0
Δ = 5²-4*2*3 = 1
√Δ = 1

x₁ = (-5-1)/6 = -1
x₂ = (-5+1)/6 = -2/3

b)
2x² - 3x +1 = 0
Δ = 9 - 2*2*1 = 1
√Δ = 1

x₁ = (3-1)/4 = 1/2
x₂ = (3+1)/4 = 1

c)
x² + 6x + 9 = 0
Δ = 36 -36 = 0

x₁ = x₂ = -b/2a = -6/2 = -3