Question

As seen in the diagram below, Santiago is building a walkway with a width of � x feet to go around a swimming pool that measures 20 feet by 9 feet. If the total area of the pool and the walkway will be 672 square feet, how wide should the walkway be?

Answer 1

Answer: 6ft

Explanation:

180+40x+18x+4x^2=672

4x^2+58x+180x=672

4x^2+58x-492=0

2x^2+29x-246=0

(x=6)(2x+41)=0

x=6 or x=-20.5

Should be 6ft