Question 264224
3(x-2*3)^2=1728
3(x-6)^2=1728
3(x^2-12x+36=1728
3x^2-36x+108-1728=0
3x^2-36x-1620=0
3(x^2-12x-540)=0
3(x-30)(x+18)=0
x-30=0
x=30 
30-2*3
30-6-24 is the sides of the square base.
Proof:
3*24^2=1728
3*576=1728
1728=1728