The expression 3x+13 represents the side length of the square in units. Thus, the correct option is C.
What is the formula for calculating the area of the square?
The formula for calculating the area of the square is as follows:
Area of the square = [tex]a^2[/tex] i.e. sides of the square.
According to the given question, the common factor of 12x+52 is 4.
Now, we take 4 out of the bracket.
It becomes 4(3x+13).
Therefore, the expression 3x+13 represents the side length of the square in units. Thus, the correct option is C.
To learn more about the perimeter of the square, refer to the link:
https://brainly.com/question/15849183
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