Posted by Sam on Saturday, July 9, 2011 at 5:51pm.
Solve
(x+18)(x18)(x+12)>0
Solution set is {x8,12}
Is this correct?

math am i right?  MathMate, Saturday, July 9, 2011 at 7:28pm
The leading term of the cubic is positive, so for x>∞, the function f(x) approaches ∞.
There should in fact be two intervals where f(x) is >0, between the two smaller zeroes, and when x>the largest zero.
If you plot the function, it will make it clear.
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