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Mathematics 7 Online
OpenStudy (anonymous):

factor completely 3x^2-21

OpenStudy (anonymous):

pull out a 3: \[3(x^2-7)\]

OpenStudy (anonymous):

This can be factored further: \[3*(x-\sqrt7)(x+\sqrt7)\]

OpenStudy (anonymous):

-3 (sqrt(7)-x) (sqrt(7)+x)

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