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Date May 2010 Marks available 6 Reference code 10M.2.sl.TZ2.4
Level SL only Paper 2 Time zone TZ2
Command term Find Question number 4 Adapted from N/A

Question

Find the term in x4 in the expansion of (3x22x)5 .

Markscheme

evidence of substituting into binomial expansion     (M1)

e.g. a5+(51)a4b+(52)a3b2+

identifying correct term for x4    (M1)

evidence of calculating the factors, in any order     A1A1A1

e.g. (52),27x6,4x2 ; 10(3x2)3(2x)2

Note: Award A1 for each correct factor.

 

term=1080x4     A1     N2

Note: Award M1M1A1A1A1A0 for 1080 with working shown.

[6 marks]

Examiners report

Although a great number of students recognized they could use the binomial theorem, fewer were successful in finding the term in x4 .

Candidates showed various difficulties when trying to solve this problem:

Syllabus sections

Topic 1 - Algebra » 1.3 » The binomial theorem: expansion of (a+b)n, nN .
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