Wen Guotai Daniel's answer to Z's Secondary 3 A Maths question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Wen Guotai Daniel
Wen Guotai Daniel's answer
66 answers (Tutor Details)
Sorry. I missed one figure "1" while expanding the terms. Here is the correct answers.