Copyright issues hit 10-year series
Source: Asiaone
My Point of View:
Since the O level Elementary and Additional Mathematics syllabus have recently changed, the ten years series might not be so relevant, instead it could cause more confusion when students are not fully aware of the out of syllabus questions.
What are your thoughts on this matter? Does it affect you?
For current GCE ‘O’ Level Secondary 3 Additional Math students:
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In O level Additional Mathematics, there is a small section on Identity inside the topic of Factor & Remainder Theorem. Today I am going to share with you the 2 different approaches to solve this kind of questions.
I am going to use the question below to show you the step by step solutions of both methods.
Given that 
for all values of x, find the value of A, of B and of C.
Let x = 1,
Let x = -2,
Let x = 0,
Thus A = 3, B = -2 and C = 2
Concept behind the Subsitution method: The value of x choosen will cause one or more of the unknowns to be “cancel off”, leaving just 1 unknown left. For example, when I choose x = 1 in the first subsituition, A & B are eliminated, allowing me to find ‘C’.
Given that for all values of x, find the value of A, of B and of C.
By comparing coefficient of 
:
LHS: 3 = A => A = 3
By comparing coefficient of 
:
LHS: 1 = 2A – A + B => B = -2
By comparing coefficient of 
:
LHS: -2 = -2A - B + C => C = 2
Thus A = 3, B = -2 and C = 2
Concept behind the Comparing Coefficient method: Expansion is usually required on one side of the equation. It takes up time. The reason for the insignificant working shown is due to the fact that the expansion is done mentally instead of written. This method is highly recommended if there is more than 1 unknown other than x on the left hand side of the equation. For example, there’s an unknown ‘D’ on the left hand side of the equation.
Which method do you usually use? And which method does your school teach you? Leave me your answer in the comment section below.
Click here for more details
Hi,
I'm Ai Ling. I enjoy coaching students who have challenges with
understanding and scoring in 'O' Level A-Maths and E-Maths. 
