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Simplifying Radical Expressions

Please see the attached file for full problem description.

Without simplifying the radicals , , and , not only can we not really see that they are like radicals, but we also can't see what the coefficients and radical parts look like so that we can add them properly.

Once we have simplified each radical we are ready to move on:

Please answer, where did the -9 come from in this problem?


Solution Summary

A radical expression is simplified. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.