When dividing radical expressions, as long as the roots are the same, we can divide the radicals using the following property. You can divide the radicala first or simplify first then divide. Either way you choose to work the problems the results will be the same.
http://infinity.cos.edu/algebra/ProblemsSolved/Chapter%2009/Chapter%209.4_Multiplication%20and%20Division%20of%20Radicals.pdf
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