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Math Help - simplifying a radical

  1. #1
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    simplifying a radical

    wolfram|alpha says this is false but doesnt

    \sqrt{36-4x^2} \Rightarrow 2\sqrt{9-x^2}


    trueq[sqrt(36-4x^2) equals 2 Sqrt[9 - x^2]] - Wolfram|Alpha
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  2. #2
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    Re: simplifying a radical

    Quote Originally Posted by Jonroberts74 View Post
    wolfram|alpha says this is false but doesnt
    \sqrt{36-4x^2} \Rightarrow 2\sqrt{9-x^2}
    trueq[sqrt(36-4x^2) equals 2 Sqrt[9 - x^2]] - Wolfram|Alpha
    On the other hand, look at this.
    Thanks from Jonroberts74
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  3. #3
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    Re: simplifying a radical

    And this.
    Thanks from Jonroberts74
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  4. #4
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    Re: simplifying a radical

    why would it state it as false? Because, something subtracting something it equals is zero.
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    Re: simplifying a radical

    And yet again. Obviously "trueq" is a bit titchy. Always trust your mind over a computer.

    -Dan
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  6. #6
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    Re: simplifying a radical

    Quote Originally Posted by Jonroberts74 View Post
    why would it state it as false? Because, something subtracting something it equals is zero.
    Because no computer algebra system is flawless.
    You may be miss-using the "is equal" operation. Although, I have never seen that operation. So I have no idea how to answer your doubt.
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