(x^2)-2x=-0.84

Solution for (x^2)-2x=-0.84 equation:

(x^2)-2x=-0.84

We move all terms to the left:

(x^2)-2x-(-0.84)=0

We add all the numbers together, and all the variables

x^2-2x+0.84=0

a = 1; b = -2; c = +0.84;
Δ = b2-4ac
Δ = -22-4·1·0.84
Δ = 0.64
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{0.64}}{2*1}=\frac{2-\sqrt{0.64}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+\sqrt{0.64}}{2*1}=\frac{2+\sqrt{0.64}}{2}
$