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a2 +b2=24
a2 +b2 +2ab -2ab=24
(a+b)2-2ab=24
(a+b)2-2*6=24
(a+b)2-12=24
(a+b)2=24+12
(a+b)2=36
l a+bl = = 6
Ob= 2(a+b) = 2 * 6 = 12