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0.6x^2-2x-9=0
a = 0.6; b = -2; c = -9;
Δ = b2-4ac
Δ = -22-4·0.6·(-9)
Δ = 25.6
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{-(-2)-\sqrt{25.6}}{2*0.6}=\frac{2-\sqrt{25.6}}{1.2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+\sqrt{25.6}}{2*0.6}=\frac{2+\sqrt{25.6}}{1.2} $
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