## Wednesday, 11 January 2012

### What is wrong?

Question 2
Describe what's wrong with the working and/or answer.
Suggest how it should look like.

1. The first answer should have been
= (1/2m)(1/2m) - (3/4n)(3/4n)
which will eventually be (1/2m+3/4n)(1/2m-3/4n).

2. 9/16 should equals to 3/4 instead of still staying as 9/16n.

3. 9/16 does not = to (9/16)(9/16), it should have been (3/4)(3/4)

4. The first part of the question should have been
=(1/2m)(1/2m)-(3/4n)(3/4n)
=(1/2m+3/4n)(1/2m+3/4n)
=(1/2m+3/4n)^2

5. 9/16 n^2 is not (9/16 n)(9/16 n). it is (3/4 n)(3/4n)

6. This comment has been removed by the author.

7. 9/16n^2 should have become (3/4n)(3/4n) instead of (9/16n)(9/16n)

8. abiyyu arif rahman1/11/2012 9:42 pm

9/16n^2≠ (9/16n)(9/16n)
9/16n^2= (3/4n)(3/4n)

9. He forgot to sq-rt 9/16
The 1st expression should be (1/2m)(1/2m)-(3/4n)(3/4n)
= (1/2m)²-(3/4n)²

Further simplify: (1/2m-3/4n)(1/2m+3/4n)

10. He did not square root 9/16

(1/2m)(1/2m)-(3/4n)(3/4n)
=(1/2m+3/4n)(1/2m-3/4n)

11. The person thought that 9/16 n^2 is the same as (9/16 n)(9/16 n) when it was supposed to be (3/4 n)(3/4 n).

12. The 9/16n^2 should be (3/4n)(3/4n) and not (9/16n)(9/16n) and so the final answer should be (1/2m+3/4n)(1/2m-3/4m)

13. He has forgot to square root 9/16 and so it shld be (3/4)(3/4)

14. Its is correct, except that it has not been simplified to its simplest form. The end result shuld look like (1/2m + 3/4n)(1/2 - 3/4n)