exam Maths Puzzle Numerical Ability

I need help solving:

2 3 5
+ _ = ___
y+3 y-4 y+6

and...

x x+3 -3
- _ = ___
x^2-1 x^2-x

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exam Other Question

Hi! I need help with square roots, Whith this one it's sasys to simplify to the simplest radical form.

The problem is:
_____
/x+5=8

Please and THank you=) Geometry. If the sides of a square are decreased by 2 cm, the area is decreased by 36 cm2. What were the dimensions of the original square?

thanks.