Question

What does “x” represent

Answer 1

The answer is 4 as 4x4 is 16 (squared means the number multiplied by itself) and

16+16+9=41

Therefore the answer is x=4

Answer 2

X represents an "unknown" value.

If you are asking for this question to be solved, please see below:

$x^2+x^2+9=41\\2x^2+9=41\\2x^2=32\\x^2=16\\x=\pm4$

X can equal either positive or negative 4.  This is because when you square a negative, the answer will be positive.