## Monday, 11 March 2013

### Quadratic - Practice 10 (Shaun Ng)

1. Answers are quite well organised. Train of thoughts clearly shown.
No conceptual error.
- Kai En

2. Your explanation shows good understanding of the mathematical concept used to solve the problem. Your problem is clear and easy to understand. It is systematic and organised, making it easy to read.

3. The mathematical concepts are sound and the correct concepts are being used to solve the question.
The explanation is clear and good, especially when explaining why (k-1)^2 is more than 0.
Presentation is neat and organised, although 'D' looks like '0' at first.

4. 1.the concepts about the relationship between types of roots and the discriminent is vey clear.
2.the process is a little complicated,you can leave the "if D>0..."part.
3.the organization of the answer is clear and complete,not neat enough ,though.

5. Your D looks like 0, so it is not very clear at first. Also, you do not state the formula for discriminant before substituting the values in. Answer is accurate and precise and concise.

6. D looks like a zero. Other than that, the concept is very clear and is there is no conceptual error.

7. The concepts are clear, precise and correct.
The explanation is clear and good.
Work is very neat and organised although D looks like 0 at first

8. - Mathematical concept is clearly shown.
- Clarity of explanation is understandable
- Organization of thoughts are shown. However, penmanship must improve.

9. Mathematical concepts applied are sound and relate to the question. Coefficients are also stated clearly.
Clear explanation, especially for the last part (k-1)^2 ≥ 0, which makes your proving easier to understand and accept.

10. Me: SHAUNYYYYYYYYYYYYY Yes your D looks like 0 lol. You should sub in the value of K into D = (k+1)^2 - 4(1)(k) to show that D > 0. Other than that, quite clearly explained but lol pic very blur.'

Dawn: I don't understand cause I'm very blur... I still understand some parts of it though. At first I didn't know you had to factorise D=k^2-2k+1 [though that's my fault] but basically it's a good explanation. :DD