Pre Calculus

Write f(x) =x^3-11x^2+18x+32 in the form f(x)= (x-k) q (x) +r when k=6 + (square root)6, and demonstrate that f(k)=r

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  1. A little synthetic division shows that

    f(x) = (x-(6+√6))(x^2+(√6-5)x+(√6-6))+2

    I leave it to you to verify that
    f(6+√6) = 2

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  2. I will try to show my synthetic division, the .... are spaces:

    6+√6 | 1 ........ -11 ........ 18 ........ 32
    .................... 6+√6 .... √6-24 .... -30
    ............ 1 ..... √6-5 ..... √6-6 ........ 2

    showing that:
    x^3-11x^2+18x+32 = (x-6-√6)(x^2 + (√6-5)x + √6-6) + 2

    that is, r = 2

    now find f(6+√6)
    = (6+√6)^3 - 11(√6+6)^2 + 18(√6+6) + 32
    = 324+114√6 - 462 - 132√6 + 18√6 + 108 + 32
    = 2 + 0√6
    = 2

    whewwwhh!

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  3. Good job with the formatting!!

    Did you post somewhere in the past as a scratchpad?

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