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OpenStudy (anonymous):
factor completely 3x^2-21
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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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