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-2x²-4x≥0
Δ = b² - 4ac = (-4)² - 4×(-2)×0 = 16 - 0 = 16
√Δ = 4
X1 = -b - √Δ/ 2a = 4 - 4/2×(-2) = 0/-4 = 0
X2 = -b + √Δ/2a = 4 + 4/2×(-2) = 8/-4 = -2
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