0,1x2=x+2

Solution for 0,1x2=x+2 equation:

0.1x^2=x+2

We move all terms to the left:

0.1x^2-(x+2)=0

We get rid of parentheses

0.1x^2-x-2=0

We add all the numbers together, and all the variables

0.1x^2-1x-2=0

a = 0.1; b = -1; c = -2;
Δ = b2-4ac
Δ = -12-4·0.1·(-2)
Δ = 1.8
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{-(-1)-\sqrt{1.8}}{2*0.1}=\frac{1-\sqrt{1.8}}{0.2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{1.8}}{2*0.1}=\frac{1+\sqrt{1.8}}{0.2}
$