check my work w/ this word problem
ok so i'm not sure if my answers are right
An open box is to be formed by cutting four identical squares from the coners of a sheet of metal 20cm by 20cm, and folding up the metal to form sides. the capasity of the box must be . what is the side length of the squares?
this is what i got
let x be the length of the missing sides
where is got a factor of (x-3)
and was left with
wich gave me x=15.44 or x=1.55
so the length can be 3cm, 15.44cm, or 1.55cm?