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15 June, 18:23

K2-4K-21. How do you factor this

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  1. 15 June, 20:38
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    Assuming yo mean

    k²-4k-21

    factor by doing

    what 2 numbers multipily to get - 21 and add to get - 4?

    -7 and 3

    (k-7) (k+3) is factored
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