-2x^2-4x-7=0

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Solution for -2x^2-4x-7=0 equation: 



-2x^2-4x-7=0

a = -2; b = -4; c = -7;
Δ = b2-4ac
Δ = -42-4·(-2)·(-7)
Δ = -40
Delta is less than zero, so there is no solution for the equation

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