Method of Differences 1 • Introduction and Notation • CP2 Ex2A • 🎯

Edexcel Core Pure Year 2

Fri 23/10/20

[jamiecroll]

I understand what to do when I have to sub in the values and I can clearly see what cancels, but I am struggling to grasp the function stuff you also mention and especially when it changes the direction and what stuff cancels threw me off. So like from 25:00 onwards I wasn't too sure. Am I able to still do well in this without getting the function stuff or what can I do to try and make it easier to get? Thanks for all the help with these videos!!

[harnamsingh]

I'm not one of your students just wanted to say this is a great video =)

[DanielMacarthur]

Sir I have my exams in a month and I cannot thank you enough for your videos!

[michaelswahla]

At 23:27 did you forget to cancel out the n^2 and (n-1)^2 from the expressions (n-2)^2(n-1)^2 and (n-1)^2n^2 on the right?

[angelkapur]

Hi. U know for question 1b) for exercise 2A. Why did it include 1/2 in front of the sigma... i didn't do that .. but the rest of my answer is right.

[khanish]

Sir I have a query regarding the function notation. If the summation is of the form f(n)-f(n+1) can you straight away use the fact that sum of un= f(1)-f(n+1)? Also do you have to show the substitutions each time of r=1, 2 etc?