book Maths Puzzle Numerical Ability

Is {{{(sqrt(x))^2 = x }}}an identity (true for all nonnegative values of x)?
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My 2006 budget is 172,588.52 and my 2005 was 165,458.32. The difference is 7,130.20. What is the percentage increaseover 2005 budget? Thanks Maria Perez find the premeter (4x+4)(x^2-x+15)