The side length of the original field is 19 feet.
What is square?
Suppose the original square is x feet wide. Since its the length and width are the same,
So, length of side of enlarged field = x+5
Area of new enlarged field =  side²  = ( x + 5 )²
So, the enlarged shape would be = ( x + 5 ) ( x + 5)
 Then ,  ( x + 5 ) ( x + 5) = 576
        ( x + 5 )²= 576
        x + 5 = √576
        x + 5  = 24
         x = 24 - 5 ⇒ 19
Hence, The side length of the original field is 19 feet.
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