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Mathematics 13 Online
OpenStudy (anonymous):

what is the sum of 5√7 and 3√28?

OpenStudy (tkhunny):

28 = 4*7

OpenStudy (anonymous):

Note that sq. rt of 28 has a factor of 4. So 5 sq rt. 7 + 3 sq.rt 4 * sq.rt 7. 5 sq rt. 7 + 6 sq.rt 7 = 11 sq. rt 7.

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