Answer:

Step-by-step explanation:
Basically when a variable with a negative exponent, such as  , you just take the reciprocal of it and then change the exponent sign, or in simple terms flip it. The reciprocal of a^{-2} and changing the exponent sign is is
, you just take the reciprocal of it and then change the exponent sign, or in simple terms flip it. The reciprocal of a^{-2} and changing the exponent sign is is  .
.
To demonstrate let’s solve the first problem:

Using what we just learned, we take the reciprocal and flip the sign of   and
 and  , which are
, which are  and
 and  respectively.
 respectively.
Therefore the equation is now:

To simplify we add the exponents (only if they have the same base, or the same variable, in this case)
Therefore our answer is:
