Answer:
8a^9 and 2^6a^18
Explanation:
For the first one multiply each value, 2 and 4 then a^3 and a^6. (tip: if the base of the same, in this case a, you can just add the exponents. equaling a^9)
For the second one, the exponents are being multiplied so its 2^6a^18 since 3x6=18