-5x^2-15=0

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Solution for -5x^2-15=0 equation: 



-5x^2-15=0

a = -5; b = 0; c = -15;
Δ = b2-4ac
Δ = 02-4·(-5)·(-15)
Δ = -300
Delta is less than zero, so there is no solution for the equation

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