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3 November, 02:16

Find the value of a of (x-1) is a factor of the polynomial a^2x^3-4ax+4a-1

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  1. 3 November, 05:06
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    a = 1.

    Step-by-step explanation:

    By the Factor theorem if (x - 1) is a factor of the polynomial f (x) then f (1) = 0.

    So we have:

    a^2 (1) ^3-4a (1) + 4a-1 = 0

    a^2 - 4a + 4a - 1 = 0

    a^2 = 1

    a = + / - 1.

    Substituting - 1 for a

    (-1) ^21^3-4 (-1) 1+4*1-1 = 1 + 4 + 4 - 1 = 8 so its can't be - 1.

    Substituting 1 for a:

    (1) ^21^3 - 4 + 4 - 1 = 0.
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