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OpenStudy (anonymous):
Factor Completely: 4x2 − 81 (4x − 9)(x + 9) (2x + 9)(2x + 9) (2x + 9)(2x − 9) (2x − 9)(2x − 9)
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OpenStudy (anonymous):
the 3rd one
OpenStudy (anonymous):
thx
OpenStudy (anonymous):
4 =2^2 x^2= x times x 81= 9^2 Apply it to the rule (a^2-b^2) = (a+b)(a-b)
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