The answer is: [A]: "roots".
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Note: √(x+5) = 4 ;
Square each side:
[√(x+5)] ² = 4² ;
x + 5 = 16 ;
Subtract "5" from each side of the equation;
x + 5 - 5 = 16 - 5 ;
to get: x = 11 ;
So, yes; there is a solution.
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