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Thread: Simplifing to get the 2 values of x

  1. #1
    Newbie FRANTICSTAR's Avatar
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    Simplifing to get the 2 values of x

    Hi,

    Sorry it's been ages since I've tried to do this, I have the following that I would like some help getting to x =

    $\displaystyle 4x^2-500x-900000=-3x^2$

    I don't thing that the answer is a whole number, I'm not too concerned about the anwser just the steps to getting there.

    Any help would be great thanks.
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  2. #2
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    Quote Originally Posted by FRANTICSTAR View Post
    Hi,

    Sorry it's been ages since I've tried to do this, I have the following that I would like some help getting to x =

    $\displaystyle 4x^2-500x-900000=-3x^2$

    I don't thing that the answer is a whole number, I'm not too concerned about the anwser just the steps to getting there.

    Any help would be great thanks.
    ?? If you want to solve,
    $\displaystyle 4x^2-500x-900000=-3x^2$

    You should realise that not only is the answer not going to be a whole number it will be imaginary also as it would change to:

    $\displaystyle 7x^2-500x-900000= 0$
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  3. #3
    Newbie FRANTICSTAR's Avatar
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    I didn't think that you could add $\displaystyle 4x^2$ with $\displaystyle 3x^2$ like : $\displaystyle 7x^2 = 3x^2 + 4x^2$

    If for example x=1 $\displaystyle 7^2$ wouldn't equal $\displaystyle 3^2 + 4^2$
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  4. #4
    Member Ruun's Avatar
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    Quote Originally Posted by FRANTICSTAR View Post
    I didn't think that you could add $\displaystyle 4x^2$ with $\displaystyle 3x^2$ like : $\displaystyle 7x^2 = 3x^2 + 4x^2$

    If for example x=1 $\displaystyle 7^2$ wouldn't equal $\displaystyle 3^2 + 4^2$
    If $\displaystyle x=1$ then $\displaystyle 7\cdot(1)^2=3\cdot(1)^2 + 4\cdot(1)^2$

    To make things easiers, think in $\displaystyle x^2$ as for example $\displaystyle A$. So $\displaystyle 7 \cdot A=3 \cdot A+4 \cdot A$
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  5. #5
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    As already mentioned be careful when you substitiute numbers in remember BODMAS or PEDMAS as it is now called, you have to do calculations in a particular order, before you multiply you have to raise to the power first if that makes sense.

    eg when x=1 $\displaystyle 7x^2 = 7*1^2 = 7*1 = 7$
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