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2x^2-33x+21=0
a = 2; b = -33; c = +21;
Δ = b2-4ac
Δ = -332-4·2·21
Δ = 921
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{-(-33)-\sqrt{921}}{2*2}=\frac{33-\sqrt{921}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-33)+\sqrt{921}}{2*2}=\frac{33+\sqrt{921}}{4} $
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