(2x+3y)^2 = 4x^2 + 12xy + 9y^2
(4x-y)^2 = 16x^2 - 8xy + y^2
81^2 = 6561
59^2 = 3481
(x+6)^2 = x^2 + 12x + 36
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(2x+3y)^2 = 4x^2 + 12xy + 9y^2
(4x-y)^2 = 16x^2 - 8xy + y^2
81^2 = 6561
59^2 = 3481
(x+6)^2 = x^2 + 12x + 36