(3x - 2y)^2 =
(2a + 5b)^2 =
(6x-9) (6x+9) =
(2x + y)^2 + ( x +3 ) ( x - 3 ) =
(7x - 2)^2 - (x+4)^2 =
(2x + 4y)^2 =
(3a - 2b)^2=
(7x-8) ( 7x+8) =
(x + 2y)^2 + (x+5) ( x-5) =
(2x-7)^2 - (x + 5)^2 =
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