SOLUTION: 3 square root sign 64x7 divided by 3 square root sign 4x I have asked this question before and a person was kind enough to answer it and it is greatly appreciated...but I do not

Question 155713: 3 square root sign 64x7 divided by 3 square root sign 4x
I have asked this question before and a person was kind enough to answer it and it is greatly appreciated...but I do not understand how the person got the answer and the answer is not one of the multiple choice answers. The three before the square is what I believe is called a n-th root...but I could be wrong... I am confused by this whole problem. The multiple choice answers are
1. x^2 3square root sign 4
2. x 3square root sign 16
3. 4x^2 3square root sign 4x^2
4. x^2 3square root sign 16
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Solve for x:
Change to exponential notation for ease of calculating:
(This, by the way, is called the cube root of x:)
Apply the power rule for exponentials:
Evaluate: N.B.
= or
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