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Thread: Using quadratic formula with a ^4

  1. #1
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    Using quadratic formula with a ^4

    Hi,

    I have this problem I need to find solutions for:

    x^4-17x^2+77=0

    I'm stuck on using the quadratic formula since its not in the right form im used to.

    I ignored the ^4 and ^2 and did the formula but got something different than the book.

    The book had the problem =x^2 not 0 anymore. Why is that?
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  2. #2
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    Re: Using quadratic formula with a ^4

    Quote Originally Posted by minneola24 View Post
    I have this problem I need to find solutions for:
    $\displaystyle x^4-17x^2+77=0$

    Can you solve $\displaystyle u^2-17u+77=0~?$

    Then let $\displaystyle u=x^2~.$
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  3. #3
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    Re: Using quadratic formula with a ^4

    Thanks =) That helped
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