a) \(2\sqrt{3}.\left(\sqrt{3}-2\right)-\left(\sqrt{3}+1\right)^2=2.3-4\sqrt{3}-\left(3+2\sqrt{3}+1\right)\)
\(=6-4\sqrt{3}-3-2\sqrt{3}-1=2-6\sqrt{3}\)
b) \(\left(2\sqrt{2}-3\right).\left(-3\sqrt{2}\right)-\left(3\sqrt{2}-2\right)^2=\left(-12+9\sqrt{2}\right)-\left(18-12\sqrt{2}+4\right)\)
\(-12+9\sqrt{2}-18+12\sqrt{2}-4=-34+21\sqrt{2}\)
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