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OpenStudy (anonymous):
Simplify: 9√7 - √28 a. 5√7 b. 7√7 c. 11√7 d. 13√7
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hero (hero):
11 root 7
OpenStudy (anonymous):
eh? √28 = √4 * √7 = 2√7 9√7 - 2√7 = 7√7 b
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