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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.
 2 years ago
 2 years 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.
 2 years ago
 2 years 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?
 2 years 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
 2 years ago

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