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A curve has equation y= x^3+ 3x^2 9x+k, where k is a constant.
1/ write down an expression for dy/dx
2/ find the xcoordinates of the two stationary points on the curve.
3/ hence find the two values of k for which the curve has stationary point on the xaxis.
 one year ago
 one year ago
A curve has equation y= x^3+ 3x^2 9x+k, where k is a constant. 1/ write down an expression for dy/dx 2/ find the xcoordinates of the two stationary points on the curve. 3/ hence find the two values of k for which the curve has stationary point on the xaxis.
 one year ago
 one year ago

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calculusfunctionsBest ResponseYou've already chosen the best response.0
I'm sure you know the power rule for derivatives. Right? So is there something specific about the problem that's perhaps troubling you?
 one year ago

MubiBest ResponseYou've already chosen the best response.0
Is the answer for no 1/ (1/4)x^4+x^3(9/2)x^2+k
 one year ago
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