Determine the values of k for which the graph of the function will have the indicated number of crossing the x-axis. a) f(x)=x² + kx + 6; one crossing b) f(x) = x² + 6x +k; zero crossings c) f(x) = x² - 6x +k; two crossings d) f(x) = kx² - 40x-25; one crossing

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