SOLUTION: reverse foil or grouping 16x^4-81

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Question 299376: reverse foil or grouping
16x^4-81
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
16x^4-81
You can start with...
(4x^2 +9)(4x^2 -9)
And keep going...
(4x^2+9)*(2x+3)(2x-3)