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2x^2-15x-1=0
a = 2; b = -15; c = -1;
Δ = b2-4ac
Δ = -152-4·2·(-1)
Δ = 233
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{-(-15)-\sqrt{233}}{2*2}=\frac{15-\sqrt{233}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{233}}{2*2}=\frac{15+\sqrt{233}}{4} $
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