15-10-2014
Mathematics

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Simplify 4 radical 20- 3 radical 45

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15-10-2014

[tex]4\sqrt{20}-3\sqrt{45}= 4*2\sqrt{5}-3*3\sqrt{5}= \\\\ =8\sqrt{5}-9\sqrt{5}= \\\\ =\boxed{-\sqrt{5}} [/tex]

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