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OpenStudy (anonymous):
Which of the following is a factor...
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OpenStudy (anonymous):
OpenStudy (blockcolder):
That expression can be factored as follows: \[3x^2y+7x^2-9y-21=x^2(3y+7)-3(3y+7)\] \[=(x^2-3)(3y+7)\] Thus the answer is definitely x^2-3.
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