Answer:
l=48, w=20
Step-by-step explanation:
Let the width of the pool be w feet, then the length will be:
[tex]l = 2w + 8[/tex]
The area of the pool is 960 square feet.
This means that:
[tex]w(2w + 8) = 960[/tex]
Expand and rewrite in standard form to get:
[tex]2 {w}^{2} + 8w - 960 = 0[/tex]
[tex] {w}^{2} + 4w - 480 = 0[/tex]
[tex]{w}^{2} + 24w - 20w- 480 = 0[/tex]
[tex]{w}(w+ 24) - 20(w + 24) = 0[/tex]
Factor to get:
[tex](w+ 24)(w - 20) = 0[/tex]
[tex]w = - 24 \: or \: w = 20[/tex]
We discard the negative value because magnitude is positive.
This means
[tex]l = 2 \times 20 + 8 = 48[/tex]
