book Maths Puzzle Numerical Ability

Please help me solve:

sqrt(x) = sqrt(x - 2) - 4

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book Other Question

Hi,
Can anyone answer this?
In cubic meters,how much greater is the volume of a cylinder with height 21m and a radius 12m than the volume of a square prism with height 21m and base 12m on a side? 6d+1=15-d