Confirmation and help:
A curve has the equation:
y= x^3 +3x^2 -9x + k, where k is a constant
(i) write down an expression for dy/dx
My solution:
dy/dx= 3x^2 + 6x - 9
Is it correct?
(ii) Find the x-coordinates of the two stationary points on the curve.
My solution
x=1 or x=-3
Is it correct?
(iii) Hence find the two values for K for which the curve has a stationary point on the x-axis.
Help please.

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