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Mathematics 23 Online
OpenStudy (anonymous):

Factor r^6-729

OpenStudy (anonymous):

difference of two cubes\[a^3-b^3-(a-b)(a^2+ab+b^2)\]

OpenStudy (anonymous):

here \[a=r^2\] \[b=9\]

OpenStudy (anonymous):

get \[(r^2-9)(r^4+9r^2+91)\]

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