2010 A-level H2 Mathematics (9740) Paper 1 Question 3 Suggested Solutions

All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

(i)
U_n = S_n - S_{n-1}

= n(2n+c) - (n-1)[2(n-1)+c]

= 4n-2+c

(ii)
U_{n-1} = 4(n+1)-2+c

U_{n+1} = U_n + 4

KS Comments:

Formulas!!! Every simple questions involving formulas!

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