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Multiple choice

If t2 - 4t + 1 = 0, then the value of (t3 + 1/t3) is

  1. 48

  2. 52

  3. 64

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

t2 - 4t + 1 = 0   or t2 + 1 = 4t                 t + 1/t = 4         Or (t + 1/t + 3 (t + 1/t) = 64 or t3 + 1/t3 = 64 - 3 x 4 = 52

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