lizatre1blk5hartesh lizatre1blk5hartesh

31-07-2016
Mathematics

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2 square root 32 - 5 square root 128

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nobillionaireNobley nobillionaireNobley

31-07-2016

\(2 \sqrt{32} -5 \sqrt{128} =2 \sqrt{16 \times 2} -5 \sqrt{64 \times 2} \\ =2 \times \sqrt{16} \times \sqrt{2} -2 \times \sqrt{64} \times \sqrt{2} \\ =2(4) \sqrt{2} -2(8) \sqrt{2} =8 \sqrt{2} -16 \sqrt{2} \\ =-8 \sqrt{2}\)

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