SOLUTION: If f(x) = x(x + 3)(x � 1), use interval notation to give all values of x where f(x)

SOLUTION: If f(x) = x(x + 3)(x � 1), use interval notation to give all values of x where f(x) > 0.

Question 7723: If f(x) = x(x + 3)(x � 1), use interval notation to give all values of x
where f(x) > 0.
Answer by khwang(438) (Show Source): You can put this solution on YOUR website!
You posted this question in wrong category.

To solve f(x) = x(x + 3)(x � 1) >0
The three roots of f(x) = 0 are -3,0 and 1 (in this order)
Consider the signs of the diagram below:
-- +++ -- ++++
----------*---------*---*-------------
-3 0 1
So, the solution of f(x)>0 is
(-3,0) U (1,+oo)
Kenny
PS: You have to redraw the diagram on your own paper.
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