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Mathematics 8 Online
OpenStudy (anonymous):

More math help :3

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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