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    Question

    If x = 15, find x5 - 16x4 +

    16x3 - 16x2 + 16x - 16 = ?
    A 1 Correct Answer Incorrect Answer
    B -3 Correct Answer Incorrect Answer
    C -1 Correct Answer Incorrect Answer
    D 3 Correct Answer Incorrect Answer

    Solution

    If x = 15 then 15 = x ⇒ x5 - 16 x4 + 16x3 - 16x2 + 16x - 16 ⇒ x5 - 15x4 - x4 + 15 x3 + x3 - 15 x2 - x2 + 15 x + x - 16 ⇒ x5 - x5 - x4 + x4 + x3 - x3 - x2 + x2 + 15 – 16 (Putting 15= x) ⇒ -1

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