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Mubi
Group Title
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
Mubi Group Title
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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calculusfunctions Group TitleBest 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

Mubi Group TitleBest 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

vipul92 Group TitleBest ResponseYou've already chosen the best response.0
dy/dx=3x^2+6x9
 one year ago
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