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15 October, 21:29

Z^2 - 6z+9=0 Factor and solve

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  1. 15 October, 21:56
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    Factor because if we have

    yz=0 then we can assume y and/or z=0

    so factor

    so the easiest way is to find what 2 numbers add to - 6 and multiply to get 9 so

    we know that they must be both - because we must have x+x = (-) and x^2 = + so therefor they must be negative

    factors of 9=3 and 3 so

    -3 and - 3

    -3+-3=-6 perfect

    (z-3) (z-3) = 0

    set each to zero

    z-3=0

    add 3

    z=3

    z=3 is the answer
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