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x^2-8.4x+17.6=0
a = 1; b = -8.4; c = +17.6;
Δ = b2-4ac
Δ = -8.42-4·1·17.6
Δ = 0.16
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{-(-8.4)-\sqrt{0.16}}{2*1}=\frac{8.4-\sqrt{0.16}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8.4)+\sqrt{0.16}}{2*1}=\frac{8.4+\sqrt{0.16}}{2} $
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