Extension 2 Methods (1 Viewer)

[xXnukerrrXx]

Just wondering, are you allowed to use 4unit methods in 3unit maths questions?

 

[cheezcake]

Yes, as long as its maths and its valid you're pretty much allowed to use whatever you can come up with, unless of course if the question specifies to use a particular method.

 

[Shadowdude]

Just wondering, are you allowed to use 4unit methods in 3unit maths questions?

Yeah, why not?

 

[HyperComplexxx]

the only thing you shouldnt use is the method of 4U integration by parts in 3U

 

[cheezcake]

the only thing you shouldnt use is the method of 4U integration by parts in 3U

I used it before and there were no problems, but this might be dependent on the teacher marking

 

[AAEldar]

the only thing you shouldnt use is the method of 4U integration by parts in 3U

You can but like you said probably not a good idea...

I used it before and there were no problems, but this might be dependent on the teacher marking

The reason that you shouldn't is that there has to be a quicker method if it's in a 3U test i.e. a nice substitution or something.

 

[mirakon]

The reason that you shouldn't is that there has to be a quicker method if it's in a 3U test i.e. a nice substitution or something.

this. Integration by parts is usually a last resort, even in 4 unit (unless specified). Usually there is a FAR easier method.

 

[Trebla]

If the questions are well written, there should be no need to resort to any Ext2 methods at all.

 

[cheezcake]

Usually, but for our question it was to find the area between an ln curve and the x axis, for 3u you'd have to transform it into an appropriate exponential find the area between the exponential and the x axis, find total area of rectangle then subtract the area you got from the exponential. Alternatively i knew integration by parts so it was about 100x quicker and less prone to making a silly mistake.