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X^2-7X-720=0
a = 1; b = -7; c = -720;
Δ = b2-4ac
Δ = -72-4·1·(-720)
Δ = 2929
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{-(-7)-\sqrt{2929}}{2*1}=\frac{7-\sqrt{2929}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{2929}}{2*1}=\frac{7+\sqrt{2929}}{2} $
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