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It depends. Is the entire expression squared or just radical 7?Assuming the latter, then 6 + (√7)^2 = 6 + 7 = 13.
4 radical 6
sqrt(24) = sqrt(4*6) = sqrt(4)*sqrt(6) = 2*sqrt(6)
6√5 + 2√5 - 7 = 8√5 - 7, which cannot be simplified.
The square root of 252 in simplified radical form is 2√63.