prove that (5x+4)⁴-80x=(5x--4)².
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(5x+4)⁴-80x
(5x+4)²×(5x+4)²-80x
(25x²+40x+16)×(25x²+40x+16)-80x
(25x²+40x+16)²-80x
625x⁴+1600x²+256-80x
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