8x2=7200

Solution for 8x2=7200 equation:

8x^2=7200

We move all terms to the left:

8x^2-(7200)=0

a = 8; b = 0; c = -7200;
Δ = b2-4ac
Δ = 02-4·8·(-7200)
Δ = 230400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{230400}=480$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-480}{2*8}=\frac{-480}{16}
=-30
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+480}{2*8}=\frac{480}{16}
=30
$