Hi there!
Assuming you are talking about [tex]144x^2[/tex], we can proceed with the equation of the area of a square, [tex]l^2=a[/tex], where [tex]l[/tex] is the side length of the square. We can set [tex]a[/tex] to be [tex]144x^2[/tex] and solve for [tex]l[/tex]:
[tex]l^2= 144x^2[/tex]
Square root both sides to isolate [tex]l[/tex]:
[tex]l=\sqrt{144x^2}[/tex]
Now, we can separate the square root into two parts:
[tex]l=\sqrt{144}\cdot\sqrt{x^2}[/tex]
And individually solve:
[tex]l=12\cdot x[/tex]
[tex]l=12x[/tex]
Thus, your answer is the second choice, 12x.
Hope this helps!
