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Mathematics 7 Online
OpenStudy (anonymous):

Find the zeros x^4 -5x^2 +4

OpenStudy (triciaal):

let u = x^2 u^2 - 5 u + 4 = 0 can you factor this?

OpenStudy (triciaal):

remember u = x^2 x = +1, -1, +2, -2

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