X*x-2x=1,56

Solution for X*x-2x=1,56 equation:

X*X-2X=1.56

We move all terms to the left:

X*X-2X-(1.56)=0

We add all the numbers together, and all the variables

-2X+X*X-1.56=0

Wy multiply elements

X^2-2X-1.56=0

a = 1; b = -2; c = -1.56;
Δ = b2-4ac
Δ = -22-4·1·(-1.56)
Δ = 10.24
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{10.24}}{2*1}=\frac{2-\sqrt{10.24}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+\sqrt{10.24}}{2*1}=\frac{2+\sqrt{10.24}}{2}
$