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X^2-3.6X-1.6=0
a = 1; b = -3.6; c = -1.6;
Δ = b2-4ac
Δ = -3.62-4·1·(-1.6)
Δ = 19.36
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{-(-3.6)-\sqrt{19.36}}{2*1}=\frac{3.6-\sqrt{19.36}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3.6)+\sqrt{19.36}}{2*1}=\frac{3.6+\sqrt{19.36}}{2} $
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