l = 3w
A = lw
48 = 3w(w)
48 = 3w^2
16 = w^2
w^2 -16 = 0
(w-4)(w +4) =0
w = 4
l = 3w
l = 3(4) = 12
width = 4
length = 12
The length of a rectangle is three times its width. If the area of the rectangle is 48, what is its length?
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