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2a²+12ab+18b²- 3a²+12b²+12ab= -a²+24ab+30b²
teraz podstawiasz
-a²+24ab+30b²= -(3√6)² +24(3√6* -√2) +30(-√2)²=-54-144 √3 +60= 6-144 √3
to chyba tak ;)