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3z^2-17z+18=0
a = 3; b = -17; c = +18;
Δ = b2-4ac
Δ = -172-4·3·18
Δ = 73
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-\sqrt{73}}{2*3}=\frac{17-\sqrt{73}}{6} $$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{73}}{2*3}=\frac{17+\sqrt{73}}{6} $
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