exam Maths Puzzle Numerical Ability

Is the following trinomial a perfect square? why or why not
x^2+18x-81

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exam Other Question

How to simplify this expression?
(2m+3n/2m^2-5mn-12n^2)/(2m^2-7mn-4n^2/m^2-8mn+16n^2)
Graph:
y= -2/3x +4 by graphing 3 points.
Thank you =)