September 2018 1 16 Report

2( a) 2(\sqrt{10}-\sqrt{15})^{2}-3(\sqrt{15}+\sqrt{10})^{2}-(3\sqrt{15}-\sqrt{10})(3\sqrt{15}+\sqrt{10}= b) (\sqrt{20}+\sqrt{45})^{2}-(2\sqrt{20}-\sqrt{45})^{2}-2(\sqrt{45}-3\sqrt{20})^{2}=


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