X*y=750

Solution for X*y=750 equation:

X*X=750

We move all terms to the left:

X*X-(750)=0

Wy multiply elements

X^2-750=0

a = 1; b = 0; c = -750;
Δ = b2-4ac
Δ = 02-4·1·(-750)
Δ = 3000
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:

$\sqrt{\Delta}=\sqrt{3000}=\sqrt{100*30}=\sqrt{100}*\sqrt{30}=10\sqrt{30}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-10\sqrt{30}}{2*1}=\frac{0-10\sqrt{30}}{2}
=-\frac{10\sqrt{30}}{2}
=-5\sqrt{30}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+10\sqrt{30}}{2*1}=\frac{0+10\sqrt{30}}{2}
=\frac{10\sqrt{30}}{2}
=5\sqrt{30}
$