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OpenStudy (anonymous):
Factor Completely: 3x^2 − 21 3(x2 − 7) 3(x + 7)(x − 7) 3(x + 7)(x − 3) Prime
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OpenStudy (anonymous):
how do you know that?
OpenStudy (anonymous):
cause im smart
OpenStudy (anonymous):
like that
OpenStudy (ybarrap):
What is the common factor between 3x^2 and -21? There's only one possibility. Take that outside and leave what remains in parens.
OpenStudy (anonymous):
3
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