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    4. x^4-2x^2-15=0
    x^4-2x^2-15=0

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    0  Views: 1509 Answers: 2 Posted: 13 years ago
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      2 Answers

      Homework site http://www.khanacademy.org/ 



      13 years ago. Rating: 2
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        x4-2x2-15 = 0


        (x2-5)( x2+3) = 0


        So either   x2+3 = 0    Or     x2-5 = 0


        x2+3 = 0  -->   x2 = -3  --> cannot be solved


        x2-5 = 0  -->    x2 = 5   -->  x = +/- √5

        13 years ago. Rating: 0
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