18x2=72

Solution for 18x2=72 equation:

18x^2=72

We move all terms to the left:

18x^2-(72)=0

a = 18; b = 0; c = -72;
Δ = b2-4ac
Δ = 02-4·18·(-72)
Δ = 5184
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{5184}=72$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-72}{2*18}=\frac{-72}{36}
=-2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+72}{2*18}=\frac{72}{36}
=2
$