Evaluate the expression. 
Definitions:
Perfect Square
A number that is the square of an integer, such as 1, 4, 9, 16, etc.
Evaluate
To figure out the valuation of an expression.
Principal Square Root
The principal square root is the non-negative root of a given number, represented as sqrt(x) for a non-negative number x.
Real Roots
The solutions of an equation that are real numbers.
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