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2015-10-11T07:37:50+08:00

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√45    = √9.5     =>√9.5 because 9x5=45 and it is equal to √45
         =√3².5     =>3².5 because 3² is equal to 9. 3x3=9
         =3√5       => I use the first law of radicals
3√5 thats the answer of your question
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I hope I help you

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