Question

How do I simplify?
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Answer 1

treat "like" radicals as like terms.... 9sqrt7 and sqrt7 are "like" terms there.

so like in algebraic expressions, 9x and x are like terms and you can combine them:

9x + x = 10x

so
9sqrt7 + sqrt7 = 10sqrt7

and don't forget to include the unlike term in your answer..:)

Answer 2

I still dont get it, thanks though!