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10x^2-11x-7=0
a = 10; b = -11; c = -7;
Δ = b2-4ac
Δ = -112-4·10·(-7)
Δ = 401
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{401}}{2*10}=\frac{11-\sqrt{401}}{20} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+\sqrt{401}}{2*10}=\frac{11+\sqrt{401}}{20} $
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