SOLUTION: Express the solution to the following inequality using interval notation. x^2 + 7x - 18 ≥ 0

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Question 759840: Express the solution to the following inequality using interval notation.
x^2 + 7x - 18 ≥ 0
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
x^2+7x-18=
(x+9)(x-2)

and since a=1 (a>0) we know that it opens upwards.
this implies that it is negative on (-9,2)
therefore our solution is...
(-oo,-9]U[2,oo)