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Math Help - Solving equations

  1. #1
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    Solving equations

    Please help me to solve these equations:

    3x - 4 = x + 5


    X x 3X = x2 + 4
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  2. #2
    Newbie joserizal's Avatar
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    Quote Originally Posted by Shandy View Post
    Please help me to solve these equations:

    3x - 4 = x + 5
    3x-x = 5+4

     2x=9

     x=\frac{9}{2}

    lets check it.

    3 * \frac{9}{2} - 4 = \frac{9}{2} + 5

    \frac{27}{2} - \frac{8}{2} = \frac{9}{2} +\frac{10}{2}

    \frac{19}{2}= \frac{19}{2}


    X x 3X = x2 + 4
    i assume that this is your equation. x*3x = x^2 +4

    3x^2= x^2 +4

    3x^2-x^2 = 4

    2x^2=4

    \sqrt{2x^2}=\sqrt{4}

    x\sqrt{2}=2

    x=\frac{2}{\sqrt{2}}

     <br />
x=\frac{2}{\sqrt{2}}*\frac{\sqrt{2}}{\sqrt{2}}<br />

    x=\frac{2\sqrt{2}}{2}

    x=\sqrt{2}

    \sqrt{2}*\sqrt{2}^2= \sqrt{2}^2 + 4

    4+2= 2+4

    6=6
    Last edited by joserizal; February 3rd 2009 at 12:10 AM.
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  3. #3
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    Thank you very much, but I made a little mistake on the second one. It was supposed to be:

    X * 3X = -X^2 + 4

    Could you please help me with that one!

    Thanks again!
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  4. #4
    Newbie joserizal's Avatar
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    Quote Originally Posted by Shandy View Post
    Thank you very much, but I made a little mistake on the second one. It was supposed to be:

    X * 3X = -X^2 + 4

    Could you please help me with that one!

    Thanks again!
     X * 3X = -X^2 + 4

    3x^2= -x^2 +4

    3x^2+x^2=4

    4x^2=4

    x^2=\frac{4}{4}

    \sqrt{x}^2=1

     <br />
x=1<br />

    let's check it.

    1 * 3 = -1 +4

    3=3
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