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-5x^2+30=0
a = -5; b = 0; c = +30;
Δ = b2-4ac
Δ = 02-4·(-5)·30
Δ = 600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{600}=\sqrt{100*6}=\sqrt{100}*\sqrt{6}=10\sqrt{6}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-10\sqrt{6}}{2*-5}=\frac{0-10\sqrt{6}}{-10} =-\frac{10\sqrt{6}}{-10} =-\frac{\sqrt{6}}{-1} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+10\sqrt{6}}{2*-5}=\frac{0+10\sqrt{6}}{-10} =\frac{10\sqrt{6}}{-10} =\frac{\sqrt{6}}{-1} $
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