exam Maths Puzzle Numerical Ability

Help!!Is my solution correct?
If not, please let me know where I went wrong?
x^2-5x-14 divided by 4-x^2

My solution is 1-1 (x^2 - 4)

thanks a bunch!!!

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exam Other Question
The Perimeter of a rectangle is 42 cm. One side is 9 cm longer than the other side. Find the lengths of the sides. m/(m-n)(m+n)/n+1/(m+n)^2