(X-6)(x+6)=8

Solution for (X-6)(x+6)=8 equation:

(X-6)(X+6)=8

We move all terms to the left:

(X-6)(X+6)-(8)=0

We use the square of the difference formula

X^2-36-8=0

We add all the numbers together, and all the variables

X^2-44=0

a = 1; b = 0; c = -44;
Δ = b2-4ac
Δ = 02-4·1·(-44)
Δ = 176
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{176}=\sqrt{16*11}=\sqrt{16}*\sqrt{11}=4\sqrt{11}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{11}}{2*1}=\frac{0-4\sqrt{11}}{2}
=-\frac{4\sqrt{11}}{2}
=-2\sqrt{11}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{11}}{2*1}=\frac{0+4\sqrt{11}}{2}
=\frac{4\sqrt{11}}{2}
=2\sqrt{11}
$