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x^2+98x+720=0
a = 1; b = 98; c = +720;
Δ = b2-4ac
Δ = 982-4·1·720
Δ = 6724
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{6724}=82$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(98)-82}{2*1}=\frac{-180}{2} =-90 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(98)+82}{2*1}=\frac{-16}{2} =-8 $
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