Edexcel FP2 Official 2016 Exam Thread - 8th June 2016

Yeah true, hopefully they give us full credit :/

You'll get full credit if your coefficients are correct and you've shown the application of de Moivre's theorem for sure.

You'll get full credit if your coefficients are correct and you've shown the application of de Moivre's theorem for sure.

How about for the first part of last q I wrote it as plus and minus 0.722 rather than arcosh0.75. It didn't say exact form I think so would it gain full marks?

how many marks was question 1?

Perfectly fine so long as you've shown how you got there

You probably also needed to write P[21/4, 0.722] and Q[21/4, -0.722] though, defining them separately as P is above the initial line and Q below in their definition

6 I believe

For the z^4=8(root3+i) i used values of k=0,1,2 and 3. Is that wrong?

No as the question didn't specify a range for the argument, thou using those values conveniently makes all the arguments between zero and 2pi.

Your answers may have different sf but they have the same dp. Although I doubt they'd penalise you for different sf, I usually tend to go to 4 or 5dp in my answers in pure just to be safe if the answer is not exact, so I work either exact up to that point or to 6dp, then write my answer to about 4dp.

Depends what accuracy they want, though if you have a solid part (a) I think they'd give you 2 for (b) if your numbers were all accurate

For the z^4=8(root3+i) i used values of k=0,1,2 and 3. Is that wrong?

For the last question first part I wrote it as 0.722, -0.722 or something rather than plus/ minus arcosh(0.75). Would that still get marks cause it didn't say in exact form?

For the z^4=8(root3+i) i used values of k=0,1,2 and 3. Is that wrong?

Pretty sure it was 0.723 to 3dp