Am i right in saying if i get completely stuck on part (a) of a question, and the next part of the question requires the answer for part (a) for you to continue, that i should just make an answer up and then i'd get some error carried forward marks?

Reply 2085

tinkerbell55

I always find connecting rate of change and vectors difficult :frown:

any tips?

Reply 2086

Bustamove

19

please may edexcel have mercy on us.... please.. pretty pleeeaaaasseee...

Reply 2087

Star Light

14

Original post by Kill3er

Am i right in saying if i get completely stuck on part (a) of a question, and the next part of the question requires the answer for part (a) for you to continue, that i should just make an answer up and then i'd get some error carried forward marks?

To be honest, if it's a question which is hard enough to get stuck on, they make that part a 'show that', or occasionally give you a value to use in the next part if you are stuck. If somehow your situation came up, and you can find no alternative, then that'd probably be the best way to go, but they normally cover that.

Reply 2088

johnh545

7

Original post by blingaling

How do you estimate an approximate value in binomial expansion? For instance from the june 2013 reserve paper it asks estimate the approximate value of (7100)^1/3 using the binomial expansion of (8-9x)^1/3 ? I know you have to always sub in x=0.1 but how do you get this value?

(7.1)^1/3*(1000)^1/3
(7.1)^1/3*10

Reply 2089

Kill3er

OP

13

Original post by Star Light

To be honest, if it's a question which is hard enough to get stuck on, they make that part a 'show that', or occasionally give you a value to use in the next part if you are stuck. If somehow your situation came up, and you can find no alternative, then that'd probably be the best way to go, but they normally cover that.

That's true, thanks :smile:

Reply 2090

Star Light

14

Original post by Kill3er

That's true, thanks :smile:

The only question type that I can think of where this could happen is in numerical methods... find x1, x2, and x3, and use that answer to find the solution to 3 decimal places or something. But since numerical methods is the easiest topic on the paper, they don't provide backups for this :smile:

Reply 2091

manlikem

2

Good luck everyone! hope the exam paper isn't as hard as c3 :frown:

Reply 2092

blingaling

1

Thank you for your answers, but I meant how do you get the x=0.1? from all that to then sub it into the binomial expansion?

Reply 2093

somevirtualguy

2

Original post by tinkerbell55

I always find connecting rate of change and vectors difficult :frown:

any tips?

They can be hard, it's always a good idea to write out what you need, for example if you need to find dx/dt, that equals dx/dv * dv/dt, of course the v could be anything, but you'll always be given something to connect the v and x and the v and t, I know this isn't the best patch up but just try to always write out what you need...

With the vectors, why not watch some of Examsolutions' videos on them? :smile:

Good luck to everyone today

(edited 8 years ago)

Reply 2094

KrotoMax

1

Exam is in a few hours.
People already want Hitler react video.
I'll go get my TARDIS

Reply 2095

sophia_e

1

anyone else feel like they will never be prepared for this exam?

Reply 2096

Nightmare8

1

Original post by tinkerbell55

I always find connecting rate of change and vectors difficult :frown:

any tips?

For vectors, always draw what you are given. Your eyes might take something that your brain can't and always try to make triangles if you are previously asked to find an angle.