# math

by simplifying,show that
(2x-3)(2x+3)-(x-4)^2= 3x^2+8x-25

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1. (2x-3)(2x+3)-(x-4)^2
= 4x^2 -9 -x^2 +8x -16
= 3x^2 +8x -25

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posted by drwls

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