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higher maths question

  • 11-02-2015 7:50pm
    #1
    mayogirlie1
    Registered Users, Registered Users 2 Posts: 68 ✭✭


    Any help greatly appreciated with this got the 1st part but stuck with 2nd part


Comments

  • #2
    skippy1977
    Registered Users, Registered Users 2 Posts: 284 ✭✭skippy1977


    Well z^2 works out to be -2-2root3i

    so z^2 +pz is -2-2root3i-p+proot3i

    If the whole thing is real then -2root3i + proot3i =0
    Divide everything by root 3 i and you are left with p = 2.

    Hope that reads okay with all the roots!!


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