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x^2-3.1x=0
a = 1; b = -3.1; c = 0;
Δ = b2-4ac
Δ = -3.12-4·1·0
Δ = 9.61
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{-(-3.1)-\sqrt{9.61}}{2*1}=\frac{3.1-\sqrt{9.61}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3.1)+\sqrt{9.61}}{2*1}=\frac{3.1+\sqrt{9.61}}{2} $
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