SOLUTION: Can you please help me i am doing radicals and square roots. i am having so much problems. Here are the problems: 1.)square root of 128y^4 fraction bar 64^2 2.)square root of 64

Question 388732: Can you please help me i am doing radicals and square roots. i am having so much problems.
Here are the problems:
1.)square root of 128y^4 fraction bar 64^2
2.)square root of 64x^2, 21y^3, 72z^2
Thank you very much
Found 2 solutions by Alan3354, josmiceli:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
1.)square root of 128y^4 fraction bar 64^2

=
=
--------------------------
2.)square root of 64x^2
= 8x
----------
21y^3
= y*sqrt(21y)
-----------
72z^2
= 6z*sqrt(2)

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
1)
Is the problem ?
If so, think of it in a way that makes sense to you.
You should know both of these basic rules:

and

Of course, can be any positive number
Rewrite your problem to simplify it

Right away I see that , so now I have

This is the same as

This answer can actually be plus or minus. I don't know if you've
covered this yet
I'll do 1 more:

There are no perfect squares contained in , since
the only factors are and

From the rules:

This answer is NOT plus or minus because of the odd exponent in
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