SOLUTION: reverse foil/or trial factoring/solve 16x^4-81

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Question 299485: reverse foil/or trial factoring/solve
16x^4-81
Answer by checkley77(12844) About Me  (Show Source):
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16x^4-81
(4x^2+9)(4x^2-9)
(4x^2+9)(2x+3)(2x-3) ans.