-5x^2=90

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Solution for -5x^2=90 equation: 



-5x^2=90

We move all terms to the left:

-5x^2-(90)=0

a = -5; b = 0; c = -90;
Δ = b2-4ac
Δ = 02-4·(-5)·(-90)
Δ = -1800
Delta is less than zero, so there is no solution for the equation

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