Pleases someone explain

When you have a negative exponent, you move the base with the negative exponent to the other side of the fraction to make the exponent positive.

For example:

or

or

When a base with an exponent is divided by a base with an exponent, you subtract the exponents together. (But you can only combine the exponents when the bases are the same)

For example:

  (can't combine because they have different bases of y and x)

When you multiply an exponent directly to a base with an exponent, you multiply the exponents together.

For example:

    First multiply the exponents together in the denominator

       Now subtract the exponents together

 (two negative signs cancel each other out and become positive)