12w(w+7) = 1728
12w^2 + 84w - 1728 = 0
w^2 + 7w - 144 = 0
(w-9)(w+16) = 0
The tank is 12x9x16
A water tank is 12m high.it has a a rectangular base, and the length is 7m more than the width. if the volume is 1728m3, find the dimensions of the tank
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