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Thread: Can anyone help me with this?

  1. #1
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    Can anyone help me with this?

    show that {1,2} ⊆ {x|x^4 - x^3 - x^2 - 5x + 6 = 0}


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  2. #2
    Member Cervesa's Avatar
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    Re: Can anyone help me with this?

    $1^4 - 1^3 - 1^2 - 5(1) + 6 = 1-1-1-5+6 = 7-7=0$

    $2^4 - 2^3 - 2^2 - 5(2) + 6 = 16 - 8 - 4 - 10 + 6 = 22-22=0$
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