Question: Union of two sets of solution

February 22 2012 toandhsp 205
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Let S1 be the set of solutions of the inequalities x^2+ 3*x + 2 >0 and S2  be the set of solutions of the inequalities x^2 - 9>=0. I want to the set S1 union S2. What must i do? Please help me. 

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