72x^2-36=0

Solution for 72x^2-36=0 equation:

72x^2-36=0

a = 72; b = 0; c = -36;
Δ = b2-4ac
Δ = 02-4·72·(-36)
Δ = 10368
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:

$\sqrt{\Delta}=\sqrt{10368}=\sqrt{5184*2}=\sqrt{5184}*\sqrt{2}=72\sqrt{2}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-72\sqrt{2}}{2*72}=\frac{0-72\sqrt{2}}{144}
=-\frac{72\sqrt{2}}{144}
=-\frac{\sqrt{2}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+72\sqrt{2}}{2*72}=\frac{0+72\sqrt{2}}{144}
=\frac{72\sqrt{2}}{144}
=\frac{\sqrt{2}}{2}
$