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OpenStudy (rish):
(3a-7b) (3a-7b)
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OpenStudy (anonymous):
=9a^2-21ab-21ab+49b^2 9a^2-42ab+49b^2
OpenStudy (lgbasallote):
9a^2 - 42ab +49b^2
OpenStudy (anonymous):
\[=(3a-7b)^2\]\[=9a^2-42ab+49^2\]
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