I just did c1, and I'm disappointed. I got 100% in the first 9 or so questions, but then I made a few mistakes.
for example.. in the simultaneous equation part b. You needed to find K.. it was out of 3.
I wrote down the discriminant formula
plugged it in.. got 64k^2-4k=0
I took out a factor of 4k and this is where I made the mistake.. instead of getting 1/16.. I got 16. Even though I worked it out at 1/16.. I just wrote 16 like an idiot.
I then proceeded to subbing in 16 into the original equation to find the solutions like you're supposed to but I obviously got different answers since I had a wrong value of K.
In total that was out 6 marks, 3 for finding K, and 3 for using this value for finding the solutions.
How many marks out of 6 would you say I'd get?
Also in part 11..I got the gradient mixed up, I worked it out as 3, found the normal to be -1/3...
I found A and B correctly by making x=0 and y=0.. I worked out the line correctly using the formula.. but just had the wrong values
how many marks would I get out of 8?
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How many marks are given for error etc? watch
- Thread Starter
Last edited by help-me333; 14-05-2013 at 12:57.
- 14-05-2013 12:55
- 14-05-2013 13:01
As long as you showed your working out I believe for the 6 marks you'd probably lose about 2-3 for getting the wrong answers but you'll get marks for using the right methods. Again for the second one you could lose between 2-3 marks for the wrong answer but correct method shown.