Binomial Expansion : C2 Edexcel January 2012 Q3 : ExamSolutions Maths Revision

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why do we only use the first 4 terms for part b, i understand b says to use a to estimate but isnt neglecting the last terms going to result in a very inaccurate result? i understand that as the terms progress they become smaller and smaller, is this perhaps the reason?

pkerrangr
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may I ask what software do you use to create these videos

safiadaud