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$\textrm{OH! I didn't think of c being 0. Tricky! (P.S. a=11, b=9, and c=0, not b=6)}$

$\textrm{OK, got it! So, I still don't understand how I would turn }11\sqrt2+9\sqrt3\textrm{ into the form of }a\sqrt{2} + b\sqrt{3} + c\sqrt{6}.$

EDIT: nevermind, I got it. THANK YOU TO EVERYBODY FOR HELPING ME WITH THIS PROBLEM! 

I got $11\sqrt2+9\sqrt3$, but how would I turn this into the form of  $a\sqrt{2} + b\sqrt{3} + c\sqrt{6}$? 

THX FOR EVERYBODY'S HELP!