Posted by Jerry on Monday, March 29, 2010 at 1:24pm.
with : x
length : x+4
x(x+4) = 12
x^2 + 4x - 12 = 0
(x+6)(x-2) = 0
x = -6 or x = 2
but clearly x has to be positive
so the width is 2 and the length is 6
check: what is 2 times 6 ?
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