16x to the power of 4 - 81
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16x^4-3^4
a^4-b^4=(a2)2-(b2)2=(a2+b2)(a2-b2)
(16x^2+3^2)(16x^2-3^2)
((4x)^2+3^2)((4x)^2-3^2)
(4x)^2+3^2)((4x+3)(4x-3))
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