algebra 117
posted by BERNIE on .
need help with this one
the length of a rectangular banner is 4 feet longer than its width if the area is 77 squar feet find the dimensions

Let
w=width
length=w+4
Area,
77=(w+4)w
Solve for w:
w²+4w77=0
(w+11)(w7)=0
So
w=7 or w=11 (reject)
=>
width = 7'
check:
7*(7+4)=77, good.