49b^4 + 4a^6 + 28a^3b^2 =
9 + 16m^2 -24m =
(3 + 4m)^2 =
25x^4 - 30x^2y + 9y^2
49a^6 + 4b^4 - 28a^3b^2
(2a^3 + 7b^2)^2
25x^2 + 30xy + 9y^2 =
(7a^3 - 2b^2)^2 =
(5x + 3y)^2
9 + 24m + 16m^2
(5x^2 - 3y)^2 =
(4m - 3)^2
