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b) -x²+4x-4≤0
-x²+4x-4=0
Δ = 16 - (-1) (-4)
Δ = 0
x₀ = -½
c) 3x²+8x>0
x(3x +8)>0
x= 0 , 3x + 8 = 8
3x = 0
x = 0