book Maths Puzzle Numerical Ability

simplify the following algebraic expression

(4y)^7
-----
(4y)^3

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book Other Question

Divide and simplify

3x^2 +13x + 4 / 3x^2-5x-12
____________ ________________
16-x^2 3x-12
I am not sure how to express this question:

ln(Ae^Bx)

I am thinking of simplifying it to

(lnA)-Blnx ?