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X2+2X-0.1=0
We add all the numbers together, and all the variables
X^2+2X-0.1=0
a = 1; b = 2; c = -0.1;
Δ = b2-4ac
Δ = 22-4·1·(-0.1)
Δ = 4.4
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{-(2)-\sqrt{4.4}}{2*1}=\frac{-2-\sqrt{4.4}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+\sqrt{4.4}}{2*1}=\frac{-2+\sqrt{4.4}}{2} $
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