Stationary Point
How do you get x=1/2 for the stationary point
I have differentiated and try to factor out x but don't get 1/2
Q 5:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Stationary%20Points%202%20QP.pdf
A:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Stationary%20Points%202%20MS.pdf
I have differentiated and try to factor out x but don't get 1/2
Q 5:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Stationary%20Points%202%20QP.pdf
A:
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C2/Topic-Qs/OCR-MEI/C2%20Differentiation%20-%20Stationary%20Points%202%20MS.pdf
Original post by JSG29
What have you got for the derivative of the function? Your error is likely to be there. If you post your workings I'll tell you where you have gone wrong
8x - x^-2
Original post by esmeralda123
8x - x^-2
That's correct, what was your next step?
Original post by esmeralda123
8x - x^-2
So set it to zero and solve for .
Show your steps, since that's where you went wrong.
Dy/dx= 8x- 1/x^2= x(8-1/x^3)
X=0, or 8-1/x^3=0
8=1/x^3
1/8=x^3
X=1/2
X=0, or 8-1/x^3=0
8=1/x^3
1/8=x^3
X=1/2
Original post by Lechatn0ir
Dy/dx= 8x- 1/x^2= x(8-1/x^3)
X=0, or 8-1/x^3=0
8=1/x^3
1/8=x^3
X=1/2
X=0, or 8-1/x^3=0
8=1/x^3
1/8=x^3
X=1/2
Why does it become 1/x^3 when you take a factor of x out
dy/dx = 8x - x^-2
Set to = 0
8x^3 = 1
1/8 = x^3
so 1/2 = x
Set to = 0
8x^3 = 1
1/8 = x^3
so 1/2 = x
Original post by esmeralda123
Why does it become 1/x^3 when you take a factor of x out
There's no factor of x out...
=
What would x be?
Quick Reply
Related discussions
- Points of inflection on a function of 9 degree
- is a repeated root a point of inflection or not neccasarily
- Math help - finding the stationary points using second derivative test
- Stationary point for curve y=3sec(2x)
- A-level maths help :(
- A level pure maths question
- How many marks roughly would this question be worth (AQA A level Maths)?
- TMUA yotta mock paper 1
- Differentiation
- Simple differentiation question
- firing a cannon
- A Snowball in Snowfall
- Math question
- A level Maths OCR question help
- A level physics - circular motion question
- Silly mechanics question
- Parabola coordinates (FP1) maths help
- Physics question phase difference
- a level maths
- have you seen/heard ice cream vans this summer?
Latest
Trending
Last reply 2 days ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
Trending
Last reply 2 days ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
