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x^2+0.8x-19.8=0
a = 1; b = 0.8; c = -19.8;
Δ = b2-4ac
Δ = 0.82-4·1·(-19.8)
Δ = 79.84
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{-(0.8)-\sqrt{79.84}}{2*1}=\frac{-0.8-\sqrt{79.84}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.8)+\sqrt{79.84}}{2*1}=\frac{-0.8+\sqrt{79.84}}{2} $
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