ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!
  • google app store apple app store
    • тЬЦ

      Question

      If x6 + 1 – √3x3 = 0

      then x108 + x90 + 15?
      A 14 Correct Answer Incorrect Answer
      B 17 Correct Answer Incorrect Answer
      C 15 Correct Answer Incorrect Answer
      D 20 Correct Answer Incorrect Answer

      Solution

      x6 + 1 – √3x3 = 0 x6 + 1 = √3x3, divided this x3 x3 + 1/x3 = √3 And we know that if x + 1/x = √3 then x6 = -1 Here we have (x3)6 = - 1 that means x18 = -1 = (-1)6 + (-1)5 + 15 = 1 – 1 + 15 = 15

      Practice Next
      More Algebra Questions
      ask-question