college algebra

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list potential rational zeros
f(x)=x^4+3x^2-4

  • college algebra -

    let z = x^2
    then
    z^2 + 3 z - 4 = 0
    (z-4)(z+1) = 0
    z = 4 or z = 1
    so
    x^2 = 4 or x^2 = 1
    so
    +/- 2 and +/- 1

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