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posted by Fai Wednesday, May 2, 2012 at 2:23pm.

Factor the following expression completely: 9x^4-81y^2

a^2-b^2 = (a+b)(a-b) first, factor out the 9 to get 9(x^4 - 9y^2) 9(x^2+3y)(x^2-3y)

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