Monday, April 26, 2010

#3



2x + 3 = 9

x = /2 [or 12?]

Mathematics - simple algebra.

The handwriting is large and generally clear, even though this class appears to only have one student in it, and he sits at the very front. It might be worth advising the student to have his eyes tested if he is unable to read smaller text at this distance. Remember that poor learning may be as a result of poor vision - the student might not even be aware that he has a problem. If the teacher does keep her handwriting that size she will have to get a bigger whiteboard when she starts doing quadratic equations. Finally, when writing algebraic equations, it is preferable to do a more cursive x for the unknown symbol, to avoid confusion with a multiplication sign.

Unfortunately, the answer is unclearly written - is it 2? 12? 1/2? Whichever of these it is meant to be, it is wrong. Here is the correct calculation:

2x + 3 = 9

Subtract 3 from both sides:
2x = 6

Divide both sides by 2:
x = 3

Given the differences in handwriting in the '2's though, it is possible that the teacher left the answer blank for the student to fill in, and is pointing for him to return to his desk. Either way, it is better to show one's working, so that if an error is made, but followed by correct calculations, the examiner may still give marks for the later parts of the answer, even if incorrect.

5/10 - could do better.

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