-x^2+2*x-0.25=0

Solution for -x^2+2*x-0.25=0 equation:

-x^2+2x-0.25=0

We add all the numbers together, and all the variables

-1x^2+2x-0.25=0

a = -1; b = 2; c = -0.25;
Δ = b2-4ac
Δ = 22-4·(-1)·(-0.25)
Δ = 3
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{3}}{2*-1}=\frac{-2-\sqrt{3}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+\sqrt{3}}{2*-1}=\frac{-2+\sqrt{3}}{-2}
$