Firstly, lots of students lost marks by not following instructions exactly.
- The solution set of an inequality isn't n<4. You have to list the elements as {0,1,2,3} or graph this on a number line.
- The cooking instructions question asked for the time in hours and minutes - if you gave it in minutes only, you lost marks.
- On the functions question, you were asked for the co-ordinates of the local max and min - if you only gave the values of x for which the max and min occur, you lose marks.
In the differentiation question there are still issues.
Right throughout the first principles question there are opportunities to lose marks. The main one that we've covered before is not having a left-hand-side, and not mentioning the concept of a limit.
Also lots of students cancelled
3h² + 6xh + h
--------------------
h
to get
3h + 6x
forgetting that h/h = 1
The complex numbers question was poorly answered. This needs to be revised. The previous entry on complex numbers is here.
Also, the performance on the laws of indices question was weak.
Almost everyone got caught on the second question where each part of the equation was already in the form 2 to the power of something. This was a part (c) question so it is unlikely to be so simple. You must work out the right-hand-side
(64 - 32 = 32 = 2^5) and then equate the powers.
This is also a good place to demonstrate the value of checking your answer.
If you do the question wrong:
3p-7 = 6-5
3p = 8
p = 8/3
Try substituting this back in to the original and you will see that it doesn't balance.
The correct way is to recognise that the RHS ends up as 2^5 and then equating the powers correctly, you get:
3p -7 = 5
3p = 12
p = 4
Also, don't forget ... always make an attempt. Many attempts are work 3 marks - which is ½%
In tomorrow's double, we will take a general look at Paper 2 and then we'll do a Paper 2 mini-mock in our second period.
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