### What's Wrong? Q8 (Type 2)

Describe what's wrong with the working and/or answer.
Suggest how it should look like.

1. This comment has been removed by the author.

2. (3w)^2 - 2(12w) + (4)^2 ≠ (3w-8)^2
= (3w-4)^2

Owen and shawn kit. Btwfyi

3. a is 3w
b is 4
he should put it as (a-b)^2, which is (3w-4)^2
and not simplify 4x2

4. The final answer should be (3w-4)^2.

5. Whats wrong: There is a transition error.

How should it look like: (3w)^2-2(12w)+(4)^2
= (3w-4)^2

Sandy and Ruoyu

6. M4®k †å¥ & Yi De8/17/2011 08:14:00 AM

The first step was wrong at first, but then written over to be corrected. But in the final answer, there was a transfer error as the person probably got confused by his/her own correction, therefore writing down the wrong answer.

7. Qian Hui & Mavis8/17/2011 08:14:00 AM

The final is wrong as the person corrected his mistake in the first step but he did not make the respective correction to the final answer.

8. Yi Chieh,Kai En, Jiajun says.....

There is a transfer error. (3w-8)^2 should be (3w-4)^2. The number 4 was not transferred properly.

9. Matthew and Wei Siew8/17/2011 08:16:00 AM

The working is correct however, the answer is wrong. it should have been (3w - 4)^2. He could have thought that "8 x 2" instead of "4^2" then he found out his mistake and changed it but forgot to change his answer.

9w^2 -24w + 16
= (3w)^2 = 2(12w) + (4)^2
= (3w - 4)^2

10. (abhi and toby)