X*y/2=30

Solution for X*y/2=30 equation:

X*X/2=30

We move all terms to the left:

X*X/2-(30)=0

We multiply all the terms by the denominator


X*X-30*2=0

We add all the numbers together, and all the variables

X*X-60=0

Wy multiply elements

X^2-60=0

a = 1; b = 0; c = -60;
Δ = b2-4ac
Δ = 02-4·1·(-60)
Δ = 240
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:

$\sqrt{\Delta}=\sqrt{240}=\sqrt{16*15}=\sqrt{16}*\sqrt{15}=4\sqrt{15}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{15}}{2*1}=\frac{0-4\sqrt{15}}{2}
=-\frac{4\sqrt{15}}{2}
=-2\sqrt{15}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{15}}{2*1}=\frac{0+4\sqrt{15}}{2}
=\frac{4\sqrt{15}}{2}
=2\sqrt{15}
$