Posted by **Sam** on Saturday, July 9, 2011 at 5:51pm.

Solve

(x+18)(x-18)(x+12)>0

Solution set is {x|-8,-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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