The length of a rectangle field is 20 less than its width. The area of the field is 12000 ft ^2. What is the width of the field?
1 answer:
L = w - 20
12000 = w × ( w - 20 )
12000 = w^2 - 20w
w^2 - 20w - 12000 = 0
( w - 10 ) ( w - 10 ) = 0
width = 10
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