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8x^2-33x-40=0
a = 8; b = -33; c = -40;
Δ = b2-4ac
Δ = -332-4·8·(-40)
Δ = 2369
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{-(-33)-\sqrt{2369}}{2*8}=\frac{33-\sqrt{2369}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-33)+\sqrt{2369}}{2*8}=\frac{33+\sqrt{2369}}{16} $
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