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0.3x^2-15x+180=0
a = 0.3; b = -15; c = +180;
Δ = b2-4ac
Δ = -152-4·0.3·180
Δ = 9
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-3}{2*0.3}=\frac{12}{0.6} =20 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+3}{2*0.3}=\frac{18}{0.6} =30 $
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