I'm pretty sure my answer is correct but can someone please double check it for me?? Thanks!

Gayle installed a rectangular section of hardwood flooring measuring 12 ft by 12 ft in her family room. She plans on increasing the area of the flooring to 256 ft2 by increasing the width and length by the same amount, x. Which equation can be used to find x?

256 = 12(12 + x)
256 = 12(12 – x)
256 = (12 + x)(12 + x)

Question

I'm pretty sure my answer is correct but can someone please double check it for me?? Thanks!
  
Gayle installed a rectangular section of hardwood flooring measuring 12 ft by 12 ft in her family room. She plans on increasing the area of the flooring to 256 ft2 by increasing the width and length by the same amount, x. Which equation can be used to find x? 
 
       256 = 12(12 + x)
        256 = 12(12 – x)
        256 = (12 + x)(12 + x)<---- 
        256 = (12 – x)(12 – x)

g_osmenaj · Answer

Yes it's correct!