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posted by lola on Sunday, February 21, 2010 at 2:12pm.

81y4 - 16 i know its A2 – b2 = (a-b)(a+b) but i cant figure it out

helpppppppp

When writing online, x^2 = x squared. (9y^2 - 4)(9y^2 + 4) = (3y - 2)(3y + 2)(9y^2 + 4)

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