8100-x^2=0

Solution for 8100-x^2=0 equation:

8100-x^2=0

We add all the numbers together, and all the variables

-1x^2+8100=0

a = -1; b = 0; c = +8100;
Δ = b2-4ac
Δ = 02-4·(-1)·8100
Δ = 32400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{32400}=180$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-180}{2*-1}=\frac{-180}{-2}
=+90
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+180}{2*-1}=\frac{180}{-2}
=-90
$