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11x^2-5x-21=0
a = 11; b = -5; c = -21;
Δ = b2-4ac
Δ = -52-4·11·(-21)
Δ = 949
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{-(-5)-\sqrt{949}}{2*11}=\frac{5-\sqrt{949}}{22} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{949}}{2*11}=\frac{5+\sqrt{949}}{22} $
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