2x-x2=0.51

Solution for 2x-x2=0.51 equation:

2x-x2=0.51

We move all terms to the left:

2x-x2-(0.51)=0

We add all the numbers together, and all the variables

-1x^2+2x-0.51=0

a = -1; b = 2; c = -0.51;
Δ = b2-4ac
Δ = 22-4·(-1)·(-0.51)
Δ = 1.96
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{1.96}}{2*-1}=\frac{-2-\sqrt{1.96}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+\sqrt{1.96}}{2*-1}=\frac{-2+\sqrt{1.96}}{-2}
$