Let f(x) = x4 - 8x2 , where x is a real number.
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Factorise x^4 - 8x^2=0
Thanks. I knew it was simple, I just wanted to make sure :P
The graph of f(x) will intersect the x axis at y = 0. So 0 = x^4 - 8x^2 = x^2(x^2-8).
This gives you x = 0, x = (8)^(1/2) and x = -(8)^(1/2).
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