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9x^2-72x-135=0
a = 9; b = -72; c = -135;
Δ = b2-4ac
Δ = -722-4·9·(-135)
Δ = 10044
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{10044}=\sqrt{324*31}=\sqrt{324}*\sqrt{31}=18\sqrt{31}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-72)-18\sqrt{31}}{2*9}=\frac{72-18\sqrt{31}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-72)+18\sqrt{31}}{2*9}=\frac{72+18\sqrt{31}}{18} $
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