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y=-3x²+9x
-3x²+9x=0
-3x(x-3)=0
-3x=0 ∨ x-3=0
x=0 ∨ x=3
y=-2x²-4x-2
-2x²-4x-2=0
Δ=(-4)² - 4* (-2) * (-2)
Δ=16-16=0
x=4/-4
x=-1