4х²+ 28cy + 49у²=(2х+7у)²
(4x² + 49y)²=16х⁴+392х²у+2401
(2x + 7y)²=4х²+ 28cy + 49у²
(x + 7y)²=х²+14ху+49у²
(2x - 7y)²=4х²-28ху+49у²
4х²+ 28cy + 49у²=(2х+7у)²
(4x² + 49y)²=16х⁴+392х²у+2401
(2x + 7y)²=4х²+ 28cy + 49у²
(x + 7y)²=х²+14ху+49у²
(2x - 7y)²=4х²-28ху+49у²