check the picture below.
solve 13 + w/7= -18
answer:w = -217
(1/7w+13 ) ) = 0
1/7w * 31 = 0
w = (-31)/1/7
w = -217
length of other diagonal is 17 feet.
we have given,
length of rectangular window = 15 feet
width of rectangular window = 8 feet
diagonal length = 17 feet
we can also apply pythagoras theorem to check if it is a diagonal of rectangle or not
i.e 17² = 15² + 8²
or 289 = 225 + 64
or 289 = 289
hence given diagonal length is the diagonal length of rectangular window.
diagonals joining opposite vertex of rectangle are equal.
.since the length of one diagonal is 17 feet.
therefore length of other diagonal will be 17 feet as well.