factoring general trinomials

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Question description

I have this for algebra 2 packet.  This is the last of 90 questions in the packet and the only one I can not solve.  the problem is:   x^2+3x-15.  I got as far as finding factors for 15 and knowing that it should it should look like this now:  (x    )(x   ).  Please help.  I keep running into dead ends.  The only factor pairs I've come up with are:  -1,15.  -15,1.  -3,5.  -5,3.

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(Top Tutor) Daniel C.
School: UCLA
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