1. The width of a rectangle is 7 feet less than its length. If the area of the rectangle is 170 square feet, then find the length and width.
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Answer:
l=length
l-7=width
A=l*w
170=l*(l-7)
170=l^2-7l
l^2-7l-170=0
factor
170=17*2*5=17*10 and 17-10=7
(l-17)(l+10)=0
l-17=0
l=17 feet
w=17-7=10 feet
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