(x-2y+4)(x+2y-4)-(x+2y+3)^2

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(x-2y+4)(x+2y-4)-(x+2y+3)^2

(x-2y+4)(x+2y-4)-(x+2y+3)^2
(x-2y+4)(x+2y-4)-(x+2y+3)^2

(x-2y+4)(x+2y-4)-(x+2y+3)^2
4y-6x--4xy-25