# Math Help - Heaviside

1. ## Heaviside

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. ## Re: Heaviside

Originally Posted by mathsforumhelp

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
Remember that $H(t-a)=\begin{cases} 0, \quad t < a \\ 1, \quad t > a\end{cases}$
You should find that $b=8$