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OpenStudy (anonymous):
Which of the following is equivalent to 16a2 - 49?
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OpenStudy (anonymous):
(7 - 4a) (7 - 4a) (4a - 7) (4a - 7) (4a + 7) (4a - 7) (7 + 4a) (7 - 4a)
OpenStudy (mertsj):
The middle one. Did you multiply them to see?
OpenStudy (anonymous):
ya but wasn't sure
OpenStudy (anonymous):
16a² - 49 = (4a)² - 7² = ( 4a - 7) ( 4a + 7)
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