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8x^2-17x-63=0
a = 8; b = -17; c = -63;
Δ = b2-4ac
Δ = -172-4·8·(-63)
Δ = 2305
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{-(-17)-\sqrt{2305}}{2*8}=\frac{17-\sqrt{2305}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{2305}}{2*8}=\frac{17+\sqrt{2305}}{16} $
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