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-0.2x^2+0.1x+0.03=0
a = -0.2; b = 0.1; c = +0.03;
Δ = b2-4ac
Δ = 0.12-4·(-0.2)·0.03
Δ = 0.034
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{-(0.1)-\sqrt{0.034}}{2*-0.2}=\frac{-0.1-\sqrt{0.034}}{-0.4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.1)+\sqrt{0.034}}{2*-0.2}=\frac{-0.1+\sqrt{0.034}}{-0.4} $
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