Question 31868
THE TOTAL AREA OF THE POOL AND THE BORDER IS (X+2)~2=400 OR X~2+4X+4=400 OR
X~2+4X-396=0 FACTORING THIS EQUATION WE GET (X-18)(X+24) OR X=18 & X=-24 
THEREFORE THE POOL IS 18 FEET LONG AND WIDE. 

PROOF (18+2)~2=400 OR 20~2=400 OR 400=400