474 ( ) 548 42. - 8 how do I arrive at this answer.
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9514 1404 393

  (64x^28)/(5y^22)

Step-by-step explanation:

The applicable rules of exponents are ...

  (a^b)^c = a^(bc)

  (a^b)(a^c) = a^(b+c)

  (a^b)/(a^c) = a^(b-c)

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First, eliminate the outside exponent on the left factor. Then use the above rules to combine factors with the same base.