SPM 2018 Add Maths Paper 1, Question 22
Solved on video in English and Bahasa Melayu · 4 marks · 5:57 video
The question
Diagram 9 shows the relation between set A, set B and set C. It is given that set A maps to set B by the function (x+1)/2 and maps to set C by fg : x -> x² + 2x + 4. (a) Write the function which maps set A to set B by using the function notation. (b) Find the function which maps set B to set C.
[4 marks]
5:57Step 1
The function that maps set A to set B is given as (x + 1)/2. Calling this function g, in function notation it is written g : x -> (x + 1)/2.
5 more steps, each with the reason for it, in the full solution
Final answer
(a) g : x → (x + 1)/2; (b) f(x) = 4x² + 3
Where students lose marks
Watch out: fg means g acts first, so g maps A to B. Then write x in terms of u before substituting.
Watch every step of this question solved on video (5:57), with the reason behind each step and a box that checks your own answer.
No card. Every past-year question on video, in English and BM.
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