Write a function rule for the area of a rectangle whose length is 6 ft more than it's width.
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In general, area of a rectangle, A = Length X Width
Assume, Width = x ft,
then according to the question, Length = (x+6) ft
Therefore, area function is, A(x) = (x+6)*x
Area function is, ............. A(x) = x^2+6x
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