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8x^2-5x-6=0
a = 8; b = -5; c = -6;
Δ = b2-4ac
Δ = -52-4·8·(-6)
Δ = 217
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{217}}{2*8}=\frac{5-\sqrt{217}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{217}}{2*8}=\frac{5+\sqrt{217}}{16} $
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