Question
If x = 15, find x5 - 16x4 +
16x3 - 16x2 + 16x - 16 = ?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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