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x^2-17x+9=0
a = 1; b = -17; c = +9;
Δ = b2-4ac
Δ = -172-4·1·9
Δ = 253
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{-(-17)-\sqrt{253}}{2*1}=\frac{17-\sqrt{253}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{253}}{2*1}=\frac{17+\sqrt{253}}{2} $
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