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I am not where this question goes, its not part of a homework either!

I am trying to figure out how to plot the heaviside (unit step) with such an expression

H(x^2-1)

so I do this(x^2-1) = 1 for x^2-1>0 -> x>+- 1

and H(x^2-1) = 0 for x^2-1<-0 -> x<-+1

But this tells me only that it equals 1 when it is x>1 because the rest would be zero! any clarification would be appreciated