Final Answer:
The sum of all exponents when
is written in simplest form with all exponents non-negative is 12.
Step-by-step explanation:
To simplify the expression, let's perform the operations step by step.
can be rewritten as
. Simplifying the terms within the numerator and the denominator gives
. To further simplify, we subtract the exponents in the denominator from the exponents in the numerator:
, resulting in

The sum of all exponents in the simplified form
is 8+2 = 10. Therefore, the sum of all exponents when the given expression is written in simplest form with all exponents non-negative is 10. Apologies for the mistake in the initial calculation.
Therefore, after simplifying the given expression to
, the sum of all exponents is 8+2 = 10, not 12.