exam Maths Puzzle Numerical Ability

z^2-7z+10/z^2+4z-45

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exam Other Question

I do not know where to begin:
a^2+2a-24/a+1
divided by
a^2-a-12/(a+1)^2
I think I should divided the top and bottom by a-1 but I am not really sure A parrallelogram has sides 6 cm and 8 cm and a 65o angle. Find the lengths of the diagnols.