What's Wrong? Q9(b) v1

15 comments:

  1. When you open the brackets, you did not change the symbol from + into -.

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  2. He didn't change the symbols from + to -. Hence, it is wrong. So, this is due to lack of practice

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  3. Forgot to change the '-' and '+' signs when you opened the brackets.

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  4. He did not change the sign when opening the brackets.

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  5. You did not change the + symbol to a - after opening brackets..... Careless(I think)

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  6. At the third step , the signs of the numbers in the brackets should change as the positive numbers in the brackets are multiply by -3.As a result, the steps after that is wrong.

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  7. When opening the RHS bracket, the symbols were not changed accordingly.

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  8. I did not change the + symbol to a - after opening brackets... (Carelessness)

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  9. After opening the brackets , the signs should change .

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  10. It should be - at the back instead as when you open brackets you have to change the symbol accordingly

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  11. He did not change the + symbol to -.

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  12. for the 12a (4th line)
    he/she should change the operation from + to -
    as - and + is -

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  13. The person did not change the sign.

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