book Maths Puzzle Numerical Ability

Hi I need a little help with this problem. The directions are to find the LCD and do not combine fractions.
13/x^2-16, 7/x-4
If you could show how you did the problem it would be a big help.. Thank you.

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book Other Question
If M and N are the midpoints of sides AB and BC of Triangle ABC right angled at B, then prove that 4(AN^2+CM^2)=5AC^2 Show that (-3,1)(5,3)(3,0) and (-5,-2) are vertices of a parallelogram.