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8x^2-15x-3=0
a = 8; b = -15; c = -3;
Δ = b2-4ac
Δ = -152-4·8·(-3)
Δ = 321
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{321}}{2*8}=\frac{15-\sqrt{321}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{321}}{2*8}=\frac{15+\sqrt{321}}{16} $
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