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OpenStudy (anonymous):
More math help :3
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OpenStudy (anonymous):
OpenStudy (anonymous):
what do you think ?
OpenStudy (anonymous):
a
OpenStudy (anonymous):
The third one
OpenStudy (anonymous):
(a-b)(a+b) = a^2 -b^2 in our case a^2 = 4x^2 and b^2 = 81 so a = 2x and b = 9 so (2x-9)(2x+9)
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