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March 27, 2017

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1. Find all rational zeros of the polynomial. Then determine any irrational zeros, and factor the polynomial completely. 3x^4-11x^3+5x^2+3x


2. Find the polynomial with leading coefficient 1 that has a degree of 4, a zero of multiplicity 2 at x=1 and a zero at x=2+i

  • Pre Calculus - ,

    We see right off that x=0 is a root.

    Any rational roots must have a numerator which divides 3, and a denominator which divides 3. So, try 3,1,1/3

    Then we have x(x-1)(3x^2 - 8x + 3)
    The quadratic formula reveals the other two roots:

    4/3 +/- √7/3
    _____________________

    If 2+i is a root, so is 2-i, so x^2 -4x + 5 is a factor.

    So, f(x) = (x-1)(x-1)(x^2 - 4x + 5)

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