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-0.1x^2+0.8x+7=0
a = -0.1; b = 0.8; c = +7;
Δ = b2-4ac
Δ = 0.82-4·(-0.1)·7
Δ = 3.44
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{3.44}}{2*-0.1}=\frac{-0.8-\sqrt{3.44}}{-0.2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.8)+\sqrt{3.44}}{2*-0.1}=\frac{-0.8+\sqrt{3.44}}{-0.2} $
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