Yes 8.54 as rational number because in can be written as 854/100

u = 2 x + 1, d u = 2 d x, d x = d u / 2

- 9 / ( 2 + 1 )² - ( - 9 / ( 0 + 1 )² =
- 9 / 9 + 9 = - 1 + 9 =
8
Two possibilities:
28^2 + x^2 = 96^2
OR
28^2 + 96^2 = c^2
784 + x^2 = 9216
subtract 784 from both side
x^2 = 8432
Take the square root of both sides
x = 91.83 NOT an Integer
28^2 + 96^2 = c^2
784 + 8216 = c^2
10,000 = c^2
Take the square root of both sides
c = 100 HYPOTENUSE