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3x^2-5x-21=0
a = 3; b = -5; c = -21;
Δ = b2-4ac
Δ = -52-4·3·(-21)
Δ = 277
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{277}}{2*3}=\frac{5-\sqrt{277}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{277}}{2*3}=\frac{5+\sqrt{277}}{6} $
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