Question 164836
3 square root sign 18 + 3 square root sign 32. 
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3sqrt(18) + 3 sqrt(32)

= 3[sqrt(9)sqrt(2) + sqrt(16)sqrt(2)]

= 3[3sqrt(2) + 4sqrt(2)]

= 3[7sqrt(2)]

= 21sqrt(2)
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Cheers,
Stan H.