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X^2+31X+70=0
a = 1; b = 31; c = +70;
Δ = b2-4ac
Δ = 312-4·1·70
Δ = 681
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{-(31)-\sqrt{681}}{2*1}=\frac{-31-\sqrt{681}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(31)+\sqrt{681}}{2*1}=\frac{-31+\sqrt{681}}{2} $
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