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como elevar um numero a potencia 0,5 ???

mestre5
   - 24 fev 2004

como eu faço um numero elevado a 0,5 ???
por ex: 2 elevado a 0,5 .....

Array ( [0] => Array ( [0] => 23000 [SQLSTATE] => 23000 [1] => 515 [code] => 515 [2] => [Microsoft][SQL Server Native Client 10.0][SQL Server]Cannot insert the value NULL into column 'nome_amigavel', table 'devmedia.dbo.space_usuario'; column does not allow nulls. INSERT fails. [message] => [Microsoft][SQL Server Native Client 10.0][SQL Server]Cannot insert the value NULL into column 'nome_amigavel', table 'devmedia.dbo.space_usuario'; column does not allow nulls. INSERT fails. ) [1] => Array ( [0] => 01000 [SQLSTATE] => 01000 [1] => 3621 [code] => 3621 [2] => [Microsoft][SQL Server Native Client 10.0][SQL Server]The statement has been terminated. [message] => [Microsoft][SQL Server Native Client 10.0][SQL Server]The statement has been terminated. ) )