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March 2, 2015

March 2, 2015

Posted by **Jaz** on Sunday, January 8, 2012 at 9:15pm.

Mrs. Mabie has a rectangle swimming pool that measures 25 feet by 14 feet. She wants to have a cement walkway installed around the perimeter of the pool. The combined area of the pool and walkway will be 672 square feet. What will be the width of the walkway?

- math -
**Reiny**, Sunday, January 8, 2012 at 10:48pmlet the width of the walkway be x ft

dimensions of the whole thing = (25+2x) by (14+2x)

(25+2x)(14+2x) = 672

350 + 78x + 4x^2 - 672=0

4x^2 + 78x - 322 = 0

x = (-78 ± √11236)/8

= 3.5 or a negative

the width should be 3.5 ft

check:

length = 25+7 = 32

width = 14 + 7 = 21

32 x 21 = 672

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