Answer: a^(-6)/27b^12
Step-by-step explanation:1. First you open the bracket and then after opening the brackets the exponents get multiplied.
2. For numerator a^(-2) - When (-2) will be multiplied with 3 it gives (-6)
3. For denominator 3b^4 - 3^3 = 26 and b^(4*3) = b^12
4. So the final answer is a^(-6)/27b^12