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10x^2+3x-20=0
a = 10; b = 3; c = -20;
Δ = b2-4ac
Δ = 32-4·10·(-20)
Δ = 809
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{-(3)-\sqrt{809}}{2*10}=\frac{-3-\sqrt{809}}{20} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{809}}{2*10}=\frac{-3+\sqrt{809}}{20} $
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