C1 differentiation
Maths and statistics discussion, revision, exam and homework help.
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C1 differentiationMorning everyone,
I've got a question and my answer has revealed that I've got the wrong idea.
'Determine the two pints on the curve with equation
where the gradient is equal to -5.
So this is what I did. I simplified the equation, differentiated it, then carried -5 over to the other side so I had a quadratic. I could factorise it so I put it through the quadratic equation. This must have been the wrong thing to do though as the answer is wrong
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Re: C1 differentiation(Original post by TenOfThem)
What answers did you get
I got
for x. The correct answers for x were 2 or 1&(1/3)
Last edited by gavinlee; 12-05-2012 at 09:20. -
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Re: C1 differentiationIs this right?(Original post by gavinlee)
Morning everyone,
I've got a question and my answer has revealed that I've got the wrong idea.
'Determine the two pints on the curve with equation where the gradient is equal to -5.
So this is what I did. I simplified the equation, differentiated it, then carried -5 over to the other side so I had a quadratic. I could factorise it so I put it through the quadratic equation. This must have been the wrong thing to do though as the answer is wrong
= 
when
then 
which equals
so x=
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Re: C1 differentiationSince when does that work?, learn all the marks schemes and apply your knowledge is the best way to get the top marks.(Original post by TenOfThem)
There is a good reason that the forum frowns on full solutions
Gavin needed to learn where he was going wrong on this question ... he needed to unpick his misconceptions -
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Re: C1 differentiationMy mistake(Original post by Alex Dom)
Since when does that work?, learn all the marks schemes and apply your knowledge is the best way to get the top marks.
Clearly looking at other people's answers/the mark scheme is the way to succeed in maths exams
How stupid am I
Where on earth did I get my foolish view that understanding the material and the question was the way forward -
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Re: C1 differentiationJust talking out of experience. He might learn that way too.(Original post by TenOfThem)
My mistake
Clearly looking at other people's answers/the mark scheme is the way to succeed in maths exams
How stupid am I
Where on earth did I get my foolish view that understanding the material and the question was the way forward -
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Re: C1 differentiationIn that case ... sorry I snarled at you(Original post by rachel0593)
Sorry I though that by showing how I got to the answer he would see where he went wrong and could apply it to another question. -
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Re: C1 differentiationDurrrrrrr(Original post by Alex Dom)
Just talking out of experience. He might learn that way too.
Again ... my stupidity ... of course with your vast experience you know what the best way for people to learn is -
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Re: C1 differentiationWhat are top marks in your opinion?(Original post by Alex Dom)
Since when does that work?, learn all the marks schemes and apply your knowledge is the best way to get the top marks.
I hardly do 1-2 past paper, i just have a quick view of the mark scheme of those papers, so does this means that i can never get top marks?
You look to be very experienced, can you give more advice on preparing maths?(Original post by Alex Dom)
Just talking out of experience. He might learn that way too.
If someone follows your advice for A-Level maths, and then if he has to give STEP/AEA, than what shall he do to prepare?
Learn all the STEP/AEA mark schemes? -
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Re: C1 differentiation(Original post by TenOfThem)
Durrrrrrr
Again ... my stupidity ... of course with your vast experience you know what the best way for people to learn is
