Can someone please help me with this problem

Answer:
12[tex]\sqrt{3}[/tex]
Step-by-step explanation:
The area (A) of a square is calculated as A = x², thus
x² = 432 ( take the square root of both sides )
x = [tex]\sqrt{432}[/tex]
= [tex]\sqrt{144(3)}[/tex]
= [tex]\sqrt{144}[/tex] × [tex]\sqrt{3}[/tex] = 12[tex]\sqrt{3}[/tex]