Answer :

343 = 7*7*7, so the square root is 7*sqrt(7), because there is one 7 left in the square root after taking out the other 2.
Final answer:
7*sqrt(7), or about 18.52
Hope I helped :)
sqrt 343 = sqrt (7x7x7) = 7x sqrt(7) 
Its 18.5202591775

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