exam Maths Puzzle Numerical Ability

How to simplify this expression?
(2m+3n/2m^2-5mn-12n^2)/(2m^2-7mn-4n^2/m^2-8mn+16n^2)

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exam Other Question

Write an equation that best models the datd:
x- -2,0,2,4
y- 3.5,7,14,28 Is the following trinomial a perfect square? why or why not
x^2+18x-81