a, b, c, d ∈ R

and ad-bc=1

find the minimum of a^{2}+b^{2}+c^{2}+ac+bd

help me!! thanks :)

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- Mar 21st 2013, 10:45 AMli00512Help!! find the minimum
a, b, c, d ∈ R

and ad-bc=1

find the minimum of a^{2}+b^{2}+c^{2}+ac+bd

help me!! thanks :) - Mar 22nd 2013, 05:20 AMli00512Re: Help!! find the minimum
sorry, it should be "find the minimum of a2+b2+c2+d2+ac+bd"