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10x^2+9x-28=0
a = 10; b = 9; c = -28;
Δ = b2-4ac
Δ = 92-4·10·(-28)
Δ = 1201
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{-(9)-\sqrt{1201}}{2*10}=\frac{-9-\sqrt{1201}}{20} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{1201}}{2*10}=\frac{-9+\sqrt{1201}}{20} $
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