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    jeepey's Avatar
    jeepey Posts: 19, Reputation: 1
    New Member
    		  
    #1

    Jan 3, 2008, 12:19 AM
    Factorising equation
    Hello,

    Can anyone tell me if it is possible to factorise:
    s(s^2 + 2s + 5) into a format of s(s +/- x) (s +/- x)?

    I can't seem find a way that works! :(
    jiten55's Avatar
    jiten55 Posts: 105, Reputation: 8
    Junior Member
    		  
    #2

    Jan 3, 2008, 01:26 AM
    s^2 + 2s + 5

    = (s + 1)^2 + 4

    = (s + 1)^2 - (2i)^2 (I = sqrt of -1)

    = (s + 1 - 2i) (s + 1 + 2i)
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