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Mathematics 9 Online
OpenStudy (anonymous):

√125 * √375

OpenStudy (alexwee123):

hint: are there any perfect squares in √125 and √375?

OpenStudy (campbell_st):

simplify the surds 1st \[5\sqrt{5}\times5\sqrt{15} = 25\sqrt{5\times15}\] \[25\sqrt{75} = 25\times5\sqrt{3} = 125\sqrt{3}\]

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