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5x^2-47x-56=0
a = 5; b = -47; c = -56;
Δ = b2-4ac
Δ = -472-4·5·(-56)
Δ = 3329
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{-(-47)-\sqrt{3329}}{2*5}=\frac{47-\sqrt{3329}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-47)+\sqrt{3329}}{2*5}=\frac{47+\sqrt{3329}}{10} $
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