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OpenStudy (anonymous):
Use the difference of two squares formula to factor. Be sure to factor out any common factors. 81x^2 - 1
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OpenStudy (anonymous):
(9x)^2 -1 -> [(3^2)x]^2 -1... don't know if this is what you want, but you might want to just do the quadratic for this., (x+1/9)
OpenStudy (anonymous):
81x^2-1 = (9x-1)(9x+1)
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