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March 29, 2017

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Find a polynomial function f(x), with real coefficients, that has 1 and 3+2i as zeros, and such that f(-1)=2 (Multiply out and simplify your answer)

  • College Algebra - ,

    f(x) = a(x-1)(x-(3+2i))(x-(3-2i))
    = a(x-1)(x^2-6x+13)
    = a(x^3-7x^2+19x-13

    f(-1) = a(-1-7-19-13) = 40a = 2
    so, a = 1/20

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