### What's Wrong? Q7

1. The student used a calculator

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3. 7b) Is wrong because the question asked for without the use of the calculator.

4. he used calculator instead he should use algebra

5. Umm... He/She used a calculator.

6. He/She should not use a calculator

7. The student is not following the method '(a+b)(a-b)-a^2'

8. 7b is wrong because the person uses the calculator when the question specifies not to use the calculator because it is hard to calculate such a big value without the use of the calculator.

9. The question stated without the use of a calculator, but the person used a calculator for this, and did not use the algebra method.

10. The student was using a calculator but not a method without a calculator to solve the question

11. He used the calculator to solve the answer, which can be inferred through (9975-10000) whereas he should have used the algebraic manipulation or expressions given in 7(a)

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13. This is wrong because, the person should have used the same method he/she used for the question above.

14. Clearly can be seen that calculator is being used.

15. did not show how to get 9975

16. He should not use calculator, he should use the method from the prev question

17. Used calculator

18. The person must have used a calculator

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20. How did he get 9975? Calculator?
No working too. :P

21. he did not show his working on how he got his answer 9975

22. The person might have forgot to bring calculator, so he thought nothing was wrong by just doing it manually...
Anyway, the person didn't apply algebra to it, and used a "calculator".

23. He did not use the algebra method to do the sum.

24. He did not use the algebra method to do the question and used the calculator.

25. He or she used a calculator instead of using the formula above.

26. Ok i understand now thanks! >.<
I could have assume that x is 100

So when the question asked 105x95=100^2
If 'x' was 100
then my question would become:
(x+5)x(x-5)-x^2
then i could solve it :D