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Posted by **BERNIE** on Friday, August 3, 2012 at 5:31pm.

the length of a rectangular banner is 4 feet longer than its width if the area is 77 squar feet find the dimensions

- algebra 117 -
**MathMate**, Friday, August 3, 2012 at 6:01pmLet

w=width

length=w+4

Area,

77=(w+4)w

Solve for w:

w²+4w-77=0

(w+11)(w-7)=0

So

w=7 or w=-11 (reject)

=>

width = 7'

check:

7*(7+4)=77, good.

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