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OpenStudy (abmon98):
A curve has equation y=x^3+3x^2-9x+k, where k is a constant. i) Write down an expression for dy/dx ii) Find the x-coordinates of the two stationary on the curve. iii) Hence, find the two values of k for which the curve has a stationary point on the x-axis.
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OpenStudy (anonymous):
3x^2+6x-9
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