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OpenStudy (anonymous):
Factor Completely: 4x2 − 81
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OpenStudy (angela210793):
(2x-9)*(2x+9)
hero (hero):
Difference of Squares = a^2-b^2 (2x-9)(2x+9)
OpenStudy (anonymous):
(2x-9)*(2x+9)
hero (hero):
I forgot to put (a+b)(a-b)
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