Need help

Discussion in 'Homework Help' started by mr.engine21, Jan 25, 2013.

  1. mr.engine21

    Thread Starter New Member

    Jan 9, 2013
    1
    0
    i got confused.need guide.

    x(t)= u(t-1)+(t-1)u(t-1)-2(t-2)u(t-2)+(t-4)u(t-4)-u(t-4)

    it is in unit step, so i convert it to sum of singularity functions.
    then i get this

    x(t)= u(t-1)+r(t-1)-2r(t-2)+r(t-4)-u(t-4)

    then i have to sketch the graph but i don't know how to do when it comes to -2r(t-2). should i separate it to become -r(t-2)-r(t-2)??
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,743
    4,795
    Please define r(t).
     
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