exam Maths Puzzle Numerical Ability

This is subtracting a rational equation. I am not able to get it. Page 444 problem # 40 ( ISBN 0536269610)

5 30
___ - ______ = 1
y-3 y^2-9
or...

5/(y-3) - 30/y^2-9 = 1

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exam Other Question
A cube has volume V=s3, where s is the length of a side.

Fill in the blank: The side length for a cube with volume 27000 m3 is

__m3 Factor completely. Use parentheses and do NOT use spaces.
14+52x-16x^2