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Math Help - I am a little stuck on this problem.

  1. #1
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    I am a little stuck on this problem.

    √13-x=X-1

    (13-X)^2=(X-1)^2

    3-X=X^2

    I get stuck after this part. The answer is suppose to be 4, can I get a little help? Thank you.
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  2. #2
    MHF Contributor
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    Re: I am a little stuck on this problem.

    Quote Originally Posted by Past45 View Post
    √13-x=X-1
    That's quite confusingly shown;
    show what's being square rooted with brackets; don't mix variables (like x and X):
    √(13 - x) = x - 1
    square both sides:
    13 - x = x^2 - 2x + 1 : understand?
    x^2 - x - 12 = 0
    I'll give you the satisfaction of finishing it!
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  3. #3
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    Re: I am a little stuck on this problem.

    Don't forget also to consider the domain.
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