Ok... 1st time posting... I'm here to prove Mr Lew(Or Yew?) wrong. Walau eh, that guy made me so worried sia... Go to your Maths file and take out the past year Maths paper 1. If your Maths file is in your locker, nevermind I post the whole question.

8. Factorise the following completely

(a) 7(x-2y) + a(2y-x)
(b) am+ 2an - 14bm - 28bn

So I did this:

(a) 7(x-2y) + a(2y-x)
-7(-x + 2y) + a (2y - x)
(2y - x)(-7 + a)

Mr Lew's ans: (7 - a)(x - 2y)

So what's the diff??? He say totally different T.T

Let's mix S.E.E. into this.

Statement: (2y - x)(-7 + a) is the same as (7 - a)(x - 2y)
Example: "(2y - x)(-7 + a) is the same as (7 - a)(x - 2y)," said Jia Boon.
Explanation: I think Mr Lew did this:
(a) 7(x-2y) + a(2y-x)
7(x - 2y) - a(-2y + x)
(x - 2y)(7 - a) [also same as (7 - a)(x - 2y), if you're so dumb you can't see]

Still not convinced? Nevermind, I show you.

(2y - x)(-7 + a)
-(-2y + x)(-7 + a)
(-2y + x)(7 - a)
So (x - 2y)(7 - a)

Still still not convinced? Nevermind, I show you again. I very patient one.
This time with (b), cause he also told me (-m - 2n)(14b - a) not = (m + 2n)(a - 14b)

My working:

(b) am+ 2an - 14bm - 28bn
a(m + 2n) + 14b(-m - 2n)
-a(-m -2n) + 14b(-m -2n)
(-m - 2n)(14b - a)

I think Mr Lew's working:

(b) am+ 2an - 14bm - 28bn
a(m + 2n) + 14b(-m - 2n)
a(m + 2n) - 14b(m + 2n)
(m + 2n)(a - 14b)

So? Still still still not convinced? Nevermind, I show you again again.

(-m - 2n)(14b - a)
-(m+2n)(14b - a)
(m + 2n)(a - 14b)

If you still still still still not convinced, I will show you "Again"


AGAIN AGAIN AGAIN AGAIN

Still still still still still not convinced, THEN ASK MRS ANG LA!!!
人的耐心是有限度的, OK?!

By the way, don't tell Mrs Ang that is Mr Lew do wrong, just say "I curious", if not later Mrs Ang fail Mr Lew then Mr Lew lose job... Just tell Mr Lew his mistake when you see him. If he say not mistake, explain pls. Tell me hor, I want know.

Lucas , Jia Shen and Derrick,
我是爱你的, 永远爱着你.