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8x^2+11x-90=0
a = 8; b = 11; c = -90;
Δ = b2-4ac
Δ = 112-4·8·(-90)
Δ = 3001
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{-(11)-\sqrt{3001}}{2*8}=\frac{-11-\sqrt{3001}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+\sqrt{3001}}{2*8}=\frac{-11+\sqrt{3001}}{16} $
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