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Math Help - 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 =

    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 =

    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,
    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:

    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 4x^2 with 3x^2 like : 7x^2 = 3x^2 + 4x^2

    If for example x=1 7^2 wouldn't equal 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 4x^2 with 3x^2 like : 7x^2 = 3x^2 + 4x^2

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

    To make things easiers, think in x^2 as for example A. So 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 7x^2 = 7*1^2 = 7*1 = 7
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