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Math Help - Is wxMaxima being lazy?

  1. #1
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    Is wxMaxima being lazy?

    Hello,

    I recently downloaded the free CAS wxMaxima. I'm really, really pleased with it. I was expecting to have to pay some serious cash for this kind of computing power.

    There is one small thing I don't quite get though. When I input a "solve for x" command involving an x under a square root, the output usually stops at the square root, treating it as though it were a different variable. This results in x remaining on both sides of the equation.

    For example, when I want to solve for x in an equation such as the following...

    \sqrt{xy}=\frac{x+y}{2}

    [input: "solve(sqrt(x*y)=(x+y)/2,x);" ]

    Instead of squaring both sides and then solving for x in a quadratic equation, wxMaxima gives me...

    x=2\sqrt{xy}-y

    Does anyone know of a way to get wxMaxima to *really* solve for x? With such a great program I imagine there must be and I am just unaware of it.

    Thanks
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by rainer View Post
    Hello,

    I recently downloaded the free CAS wxMaxima. I'm really, really pleased with it. I was expecting to have to pay some serious cash for this kind of computing power.

    There is one small thing I don't quite get though. When I input a "solve for x" command involving an x under a square root, the output usually stops at the square root, treating it as though it were a different variable. This results in x remaining on both sides of the equation.

    For example, when I want to solve for x in an equation such as the following...

    \sqrt{xy}=\frac{x+y}{2}

    [input: "solve(sqrt(x*y)=(x+y)/2,x);" ]

    Instead of squaring both sides and then solving for x in a quadratic equation, wxMaxima gives me...

    x=2\sqrt{xy}-y

    Does anyone know of a way to get wxMaxima to *really* solve for x? With such a great program I imagine there must be and I am just unaware of it.

    Thanks
    It is probably because it does not know that you are assuming both x and y are real, try to_poly_solve

    CB
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  3. #3
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    Nope, that didn't help.
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