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Math Help - Matrix equation

  1. #1
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    Matrix equation

    Picture say all ik its easy but im stuck somehow:/
    Attached Thumbnails Attached Thumbnails Matrix equation-image.jpg  
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    fkf
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    Re: Matrix equation

    You can solve it with co factor expansion since we know that the determinant is going to be zero.

    We then have
    (1)*(x-x)-(x-1)(x^2-4)+(-1)(x^2-4) = 0 <=> x_1 = -2, x_2 = 0, x_3 = 2
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    Re: Matrix equation

    Thats not how i shall solve it.. Factor is like next chapter they somehow solve this equation with that det
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    Re: Matrix equation

    Can you specify how you are supposed to solve calculate the determinant?
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    Re: Matrix equation

    Its the (2) the prob i get same but dont get -x^3Matrix equation-image.jpg
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    Re: Matrix equation

    Quote Originally Posted by Petrus View Post
    Its the (2) the prob i get same but dont get -x^3Click image for larger version. 

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    Do you mean were
    x+4(x-1)-x^2+4-x-x^2(x-1) = x+4x-4-x^2+4-x-x^3+x^2 = 4x-x^3

    ?
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    Re: Matrix equation

    Just u type it made me solve it idk why but now i understand it!!! Ty alot
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