Question 436857
Area=LxW
x(x+1.6)=1591.4
x2+1.6x=1591.4
Multiply by 10:
10x2+16x-15914=0
*[invoke quadratic "x", 10, 16,-15914 ]
Throwing out the negative answer, we get the width of the door to be 39.10 ft, and the height to be 40.7 feet.  Must be one big a** door.