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7x^2-27x+4=0
a = 7; b = -27; c = +4;
Δ = b2-4ac
Δ = -272-4·7·4
Δ = 617
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{-(-27)-\sqrt{617}}{2*7}=\frac{27-\sqrt{617}}{14} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-27)+\sqrt{617}}{2*7}=\frac{27+\sqrt{617}}{14} $
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