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2x^2+19x-7.7=0
a = 2; b = 19; c = -7.7;
Δ = b2-4ac
Δ = 192-4·2·(-7.7)
Δ = 422.6
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{-(19)-\sqrt{422.6}}{2*2}=\frac{-19-\sqrt{422.6}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(19)+\sqrt{422.6}}{2*2}=\frac{-19+\sqrt{422.6}}{4} $
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