2x⁴y²-196y⁴-(1/196)*x⁸=-((1/14)²*x⁸-2*x⁴*y²+14²*y⁴)=
=-(x⁴/14)²-2*(1/14)*x⁴+(14*y²)²=-((x⁴/14)-14*y²)².
2x⁴y²-196y⁴-(1/196)*x⁸=-((1/14)²*x⁸-2*x⁴*y²+14²*y⁴)=
=-(x⁴/14)²-2*(1/14)*x⁴+(14*y²)²=-((x⁴/14)-14*y²)².