X^2+y^2=1360

Solution for X^2+y^2=1360 equation:

X^2+X^2=1360

We move all terms to the left:

X^2+X^2-(1360)=0

We add all the numbers together, and all the variables

2X^2-1360=0

a = 2; b = 0; c = -1360;
Δ = b2-4ac
Δ = 02-4·2·(-1360)
Δ = 10880
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:

$\sqrt{\Delta}=\sqrt{10880}=\sqrt{64*170}=\sqrt{64}*\sqrt{170}=8\sqrt{170}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{170}}{2*2}=\frac{0-8\sqrt{170}}{4}
=-\frac{8\sqrt{170}}{4}
=-2\sqrt{170}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{170}}{2*2}=\frac{0+8\sqrt{170}}{4}
=\frac{8\sqrt{170}}{4}
=2\sqrt{170}
$