Tham KY's answer to Willy.wonka's Junior College 1 H2 Maths question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Tham KY
Tham Ky's answer
6052 answers (Tutor Details)
1st
For your reference only, coz I can't get part b), did a few times still can't get the standard answer... Maybe you can spot the mistake...