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Math Help - Heaviside

  1. #1
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    Heaviside


    Heaviside-screen-shot-2012-10-31-6.49.22-pm.png

    Answer

    f(t) = 7H(t) + bH(t-5)

    when t = 5
    f(5) = 49 + 7b
    15 = 49 + 7b
    -34 = 7b
    b = -34/7

    Is it correct?


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  2. #2
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    Re: Heaviside

    Quote Originally Posted by mathsforumhelp View Post

    Click image for larger version. 

Name:	Screen Shot 2012-10-31 at 6.49.22 PM.png 
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    Answer

    f(t) = 7H(t) + bH(t-5)

    when t = 5
    f(5) = 49 + 7b
    15 = 49 + 7b
    -34 = 7b
    b = -34/7

    Is it correct?


    Report Abuse
    No. Did you plug your answer back into the original equation?

    Remember that H(t-a)=\begin{cases} 0, \quad t < a \\ 1, \quad t > a\end{cases}


    You should find that b=8
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