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10 February, 17:52

For which k will the graph of f (x) = x^2-kx+k^2 cross the x-axis twice?

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  1. 10 February, 18:22
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    For the graph to cross the x axis twice, b²-4ac needs to be larger than 0

    b=-k, a=1, c=k²

    b²-4ac=k²-4k²=-3k²

    -3k² will never be larger than 0.
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