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0.4x^2+0.7x-0.8=0
a = 0.4; b = 0.7; c = -0.8;
Δ = b2-4ac
Δ = 0.72-4·0.4·(-0.8)
Δ = 1.77
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{-(0.7)-\sqrt{1.77}}{2*0.4}=\frac{-0.7-\sqrt{1.77}}{0.8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.7)+\sqrt{1.77}}{2*0.4}=\frac{-0.7+\sqrt{1.77}}{0.8} $
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