The bookshelf is one inch smaller that 6.5 feet.
6 feet = 6 x 12 = 72 + 6 in(for the half foot) = 78 inches.
So bookshelf < windows
Rewriting the formula in standard form would be x^2-8x+14=0
d = 16.76 inches
Step-by-step explanation:
We can extend the definition of the Pythagorean theorem to 3-dimensions:

Let x = 10 in
y = 10 in
z = 9 in

