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Mathematics 7 Online
OpenStudy (anonymous):

Factor Completely: 3x^2 − 21 3(x2 − 7) 3(x + 7)(x − 7) 3(x + 7)(x − 3) Prime

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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