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-9x²+6x+1=0
Δ = 36 + 36 = 72 √Δ = 6√2
9x²+6x+1 = 0
(3x+1)² = 0
3x + 1 = 0
3x = -1 / : 3
x = - 1/3
1 - 3x ≠ 0 ⇒ D = R \ { }
7x+6 = - 4(1 - 3x)
7x+6 = - 4 +3x
7x-3x= -4-6
4x = -10 / : 4
x =
x = 2