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Math Help - Quadratic Equation

  1. #1
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    Quadratic Equation

    k^2-7=0
    I don't even know where to start. There wasn't any examples in my book that matches this problem. If anyone could assist.

    Edit: I'm sorry, It's "0"
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  2. #2
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    Re: Quadratic Equation

    you can start from this point:

    k^2=7

    solve for k ...

    OR

    from this piont:

    k^2-(\sqrt 7)^2=0

    factorize and solve ...
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  3. #3
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    e^(i*pi)'s Avatar
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    Re: Quadratic Equation

    Quote Originally Posted by HellBunny View Post
    k^2-7=0
    I don't even know where to start. There wasn't any examples in my book that matches this problem. If anyone could assist.

    Edit: I'm sorry, It's "0"
    What do you know about the difference of two squares?
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  4. #4
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    Re: Quadratic Equation

    Quote Originally Posted by e^(i*pi) View Post
    What do you know about the difference of two squares?
    One is easier to solve than the other
    But now I understand how to solve the problem. I should had seen it in the beginning. Thanks you two.
    Answer is: {7,-7}
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  5. #5
    Super Member Quacky's Avatar
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    Windsor, South-East England
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    Re: Quadratic Equation

    Incorrect. Why did you draw that conclusion? Study posts #2 and #3 carefully.
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  6. #6
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    Re: Quadratic Equation

    That's the wrong answer? Then I don't know. Just thought it was right. What you guys want me to answer? 7 Couldn't be squared, so I assumed k={7,-7} OH! I see. I written down the answer incorrectly.
    + -  \sqrt 7
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  7. #7
    Super Member Quacky's Avatar
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    Re: Quadratic Equation

    There you go.
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