x2=90,25

Solution for x2=90,25 equation:

x2=90.25

We move all terms to the left:

x2-(90.25)=0

We add all the numbers together, and all the variables

x^2-90.25=0

a = 1; b = 0; c = -90.25;
Δ = b2-4ac
Δ = 02-4·1·(-90.25)
Δ = 361
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{361}=19$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-19}{2*1}=\frac{-19}{2}
=-9+1/2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+19}{2*1}=\frac{19}{2}
=9+1/2
$