Wednesday, 25 March 2015

Algebra (I): What's Wrong?

29 comments:

  1. It should be +10y, Not -10y.

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  2. It should be +10y because it's -5 multiplied by -2y. Negative multiplied by negative is positive.

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  3. It should be '+10' and not '-10' on the second line.

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  5. The -10y in the second line should be +10y and the 6x^2 and 2xy in the second line should not have been divided by x

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  6. -10y should be 10y on the scene line

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  7. It should be +10y and not -10y on second line

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  8. It should be +10y and not -10y on second line

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  9. Line 1 should be +10y
    There should not be that line 3 as 6x^2-2xy is not 6x-2y, making the ans wrong
    If line 3 was correct, line 4 should be -9x-8y

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  10. Line 1 should be +10y
    There should not be that line 3 as 6x^2-2xy is not 6x-2y, making the ans wrong
    If line 3 was correct, line 4 should be -9x-8y

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  11. It is +10 on the second line , a -5 time -2 = 10. A negative times a negative equals to a positive.

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  12. the 6x'2 was transfered wrongly and so is the 2xy

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  13. ON line 1 the ,-10y should be +10y.
    ON line 2 the, 6x-2y should remain constant as u cannot simplify it when subtracting, only when it is in a fraction.

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    Replies
    1. should remain constant at 6x^2-2xy

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  14. It should be+10 and not -10 on the second line.

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  15. It should be +10, not -10 on the second line

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  16. the -10y on the second line should be positive

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  17. the -10y on the second line should be positive

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  18. This comment has been removed by the author.

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  19. Mistake:

    The mistake is in the third line and it is a transfer error as the ^2 of 6x^2 and the x of the 2xy was not carried over.
    Also, due to this mistake, the incorrect equation has been simplified further, giving another error.

    Correct Answer:

    The ^2 and x must be carried down and as the equation cannot be simplified further, the answer is 6x^2 - 2xy - 15x - 10y.

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  20. -10y should be +10y as -5 multiply by -2y is positive which is +10y
    The third line should be 6x^2-2xy-15x+10y
    The final answer is the third line

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  21. -10y should be +10y as -5 multiply by -2y is positive which is +10y
    The third line should be 6x^2-2xy-15x+10y
    The final answer is the third line

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  22. On the first line it should be +10y not -10y and on the second line 2x^2 and 2xy cannot be divided by x as it is not a fraction

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