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Pre-Cal.

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find all the zeros of the following polynomial. Write the polynomial in fraction form. Show all the work.
f(x)= x^4+3x^2-40

  • Pre-Cal. -

    Let x^2 = y
    y^2 +3y -40 = 0
    (y+8)(y-5) = 0
    y = -8 or 5
    x = sqrty = +/- isqrt8 or +/- sqrt5
    f(x) = (x - sqrt5)(x + sqrt5)(x^2 +8)

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