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March 30, 2017

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x+5y - 6z = 2
kx +y -z = 3
5x -ky +3z =7
For what values of k does the system have a unique solution

  • math - ,

    The determinant
    |1 5 -6|
    |k 1 -1|
    |5 -k 3|
    must be non-zero.

    Turn that into an inequality for k.

    (3 -k) +(-25 -15k)+(-6k^2 +30) NOT = 0

  • math - ,

    I don't know

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