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9x^2-58x+9=0
a = 9; b = -58; c = +9;
Δ = b2-4ac
Δ = -582-4·9·9
Δ = 3040
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3040}=\sqrt{16*190}=\sqrt{16}*\sqrt{190}=4\sqrt{190}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-58)-4\sqrt{190}}{2*9}=\frac{58-4\sqrt{190}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-58)+4\sqrt{190}}{2*9}=\frac{58+4\sqrt{190}}{18} $
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