Answer:
, 
Step-by-step explanation:
The total area of the pool and the walkway is:




The roots of the second-order polynomial is:
and 
The only possible root is:

The other dimension of the pool is:



Answer:
-25 and 2
Step-by-step explanation:
x + y = -23
xy = 50, so y = 50 /x
.
x + 50/x =-23, x^2 +23x - 50 = (x-2)(x+25)
so 2 and -25
Y=-3x+23
distribute -3, get y alone (add 2 to both sides)
0.36363636363 is the answer