U= {(1,2,2); (0,-1,1-2); (2,3,2+1); (1,0,2-2) tìm số chiều và một cơ sở W của không gian con bởi hệ vecto U

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal