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.0006x^2-65x+220000=0
a = .0006; b = -65; c = +220000;
Δ = b2-4ac
Δ = -652-4·.0006·220000
Δ = 3697
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-65)-\sqrt{3697}}{2*.0006}=\frac{65-\sqrt{3697}}{0.0012} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-65)+\sqrt{3697}}{2*.0006}=\frac{65+\sqrt{3697}}{0.0012} $
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