waecE-LEARNING
Home
Technical
Mathematics
Languages
Science
Social Science
Art
Literature Arabic Islamic Studies C.R.K HistoryMusicVisual Art Clothing/Textile Home Management Shorthand
 
General Mathematics Paper 2, Nov/Dec. 2009  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 Main
General Comments
Weakness/Remedies
Strength
Question 1

Simplify, without using tables or calculator

  1. 31/3 ÷ 11/4 – 4/9;
  2. 2 + √96 - 4 (√6 -1)2 and express your answer in the form m + n√6 where   

m and n are real numbers.

_____________________________________________________________________________________________________
Observation

 

The part (a) of the question required the use of BODMAS rule, finding the LCM and simplifying.  Most candidates were reported to have followed this procedure and were able to manipulate the fractions well.  However, some candidates misinterpreted ” ÷” to mean “ + ”.   Others subtracted first before dividing.       31/3  ÷  11/4  –  4/9   =  10/3  x  4/5  –  4/9   =   8/3  – 4/9   =   20/9   =  22/9
            
            In part (b), many candidates reportedly found the expansion of (√6 -1)2
quite challenging.  Others could not reduce √96 to its lowest form.  The expansion of (√6 -1)2 = (√6 -1) (√6 -1) = 6 -√6 -√6 + 1 = 7 - 2√6.        √96 = √6 x 16 = 4√6
Therefore 2 + √96 – 4(√6 -1)2 = 2 + 4√6 – 4(7-2√6) = 2 + 4√6 – 28 + 8√6 which after a little computation resulted in -26 + 12√6.

 

Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2012 The West African Examinations Council. All rights reserved.