X2-18x*81=0

Solution for X2-18x*81=0 equation:

X2-18X*81=0

We add all the numbers together, and all the variables

X^2-18X*81=0

Wy multiply elements

X^2-1458X=0

a = 1; b = -1458; c = 0;
Δ = b2-4ac
Δ = -14582-4·1·0
Δ = 2125764
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{2125764}=1458$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1458)-1458}{2*1}=\frac{0}{2}
=0
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1458)+1458}{2*1}=\frac{2916}{2}
=1458
$