(16x4 - 81y4) ÷ (2x - 3y)
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(2x)^4-(3y)^4={(2x) ^2 -(3y)^2} (4x^2 +9y^2)
=(2x+3y)(2x-3y)(4x^2 +9y^2)
(16x^4-81y^4)/2x-3y=(2x+3y)(4x^2 +9y^2)
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