-x+x^2=195

Solution for -x+x^2=195 equation:

-x+x^2=195

We move all terms to the left:

-x+x^2-(195)=0

We add all the numbers together, and all the variables

x^2-1x-195=0

a = 1; b = -1; c = -195;
Δ = b2-4ac
Δ = -12-4·1·(-195)
Δ = 781
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{781}}{2*1}=\frac{1-\sqrt{781}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{781}}{2*1}=\frac{1+\sqrt{781}}{2}
$