Book Maths Puzzle Algebra

Simplify

(-2a^2B^-1)^3/(3ab^0)^3

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Book Other Question

I am having trouble with the array method. The two fractions are 4 and 1/2 and 5 and 1/3. I did it the traditional way and got 24. But I am having trouble with the array method. I need to be able to divide the following. Can this be done with long division - if so, is the answer 1 with a remainder?



(x^2 + x - 72)/(x^2 - 81)