exam Maths Puzzle Numerical Ability

I need help with an exponent problem:
(3a^2 x b^3)^-2x

So far I have 1 over (3a^2 x b^3)(3a^2 x b^3)

But I am not sure what to do next.

Thank you!

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exam Other Question
Which of the following is equivalent to 7 to the 77th power minus 7 to the 76th power? 7 ^ 77 - 7 ^76
a. 7
b. 7 ^ 77-76
c. 7 ^ 77/76
d. 7(77-76)
e. 7^76(6)

I believe that e 4/52=3/51 how do you solve this? i know how to make it in the form i think but i foregot how to solve it