Express in positive integer bases and exponents.
Rewrite the expression so that the exponents share common bases (5 and 3).
Remember that when the result of multiplication is raised to a power, then the exponent of each element inside the brackets is multiplied by that power.
Then divide. When dividing powers that have the same base, subtract the exponents.
A number raised to a negative power is equal to the reciprocal of that number raised to the positive value of the power, so is equal to .