Part 1:Before we begin, you need to remember the following rule:
The given expression is:
Since the base is the same in both numerator and denominator, we can apply the above rule.
This means that:
= 12¹⁻³ = 12⁻²
Part 2:Before we begin, you need to remember the following rule:x⁻ᵃ =

Now,
from part 1, we simplified the expression into 12⁻²
Since the power is negative, we can apply the above rule.
This means that:12⁻² =

Hope this helps :)