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OpenStudy (anonymous):
r^2+4r-21
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OpenStudy (anonymous):
(r+7)(r-3) 7 and -3 multiplied together gives -21 added together gives 4
OpenStudy (anonymous):
r^2 + 7r - 3r -21 r(r+7)-3(r+7) (r-3)((r+7)
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