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10x^2-7x-40=0
a = 10; b = -7; c = -40;
Δ = b2-4ac
Δ = -72-4·10·(-40)
Δ = 1649
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{-(-7)-\sqrt{1649}}{2*10}=\frac{7-\sqrt{1649}}{20} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{1649}}{2*10}=\frac{7+\sqrt{1649}}{20} $
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