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x^2-9x-722=0
a = 1; b = -9; c = -722;
Δ = b2-4ac
Δ = -92-4·1·(-722)
Δ = 2969
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{-(-9)-\sqrt{2969}}{2*1}=\frac{9-\sqrt{2969}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{2969}}{2*1}=\frac{9+\sqrt{2969}}{2} $
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