exam Maths Puzzle Numerical Ability

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=)

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exam Other Question
one positive integer is 7 less than twice another. the sum of their squares is 346. find the integers

i dont understand how to set this up I need help solving:

2 3 5
__ + ___ = _____
y+3 y-4 y+6

and...

x x+3 -3
____ - _____ = _____
x^2-1 x^2-x