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x^2-3x-1.25=0
a = 1; b = -3; c = -1.25;
Δ = b2-4ac
Δ = -32-4·1·(-1.25)
Δ = 14
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)-\sqrt{14}}{2*1}=\frac{3-\sqrt{14}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{14}}{2*1}=\frac{3+\sqrt{14}}{2} $
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