hello, can you help me to solve this question?
thank you''

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  1. (x+3)(x-3)>0

    which means x cannot be 3, or -3

    Then test to see if the inequality is good for -inf<x<-3, from -3<x<3, and from 3<x<inf

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  2. bobpursley,

    How can you factor x^2 + 9 into
    (x - 3) (x + 3) when there is a PLUS sign between x^2 and the constant 9?

    Get my point?

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