how do i factor f(x) = x^4 - 8x^2 + 8
I'm trying to get x-intercepts for a graph.
thanks for your help
x^4 - 8x^2 + 8 = (x^2-4)^2 - 8 = (x^2-4-sqrt(8))(x^2-4+sqrt(8))
x-int = +/-sqrt(4+sqrt(8))
and
x-int = +/-sqrt(4-sqrt(8))
Comments
x^4 - 8x^2 + 8 = (x^2-4)^2 - 8 = (x^2-4-sqrt(8))(x^2-4+sqrt(8))
x-int = +/-sqrt(4+sqrt(8))
and
x-int = +/-sqrt(4-sqrt(8))