Qualification > Math

[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !

<< < (64/111) > >>

leebux101:
may june 2003 Q5 , what are the complex numbers and how to do part i)
please asap! =D thanks a gziliion in advance! =D

ShiningStar:
I have a question:
State the range of values of x for which the expansion (1-4x)-3 is valid. ( Q3 Paper 9202/1/O/N/01)
What I did is:
-1<1-4x<1
-2<-4x<0
0<x<1/2
Please correct me if there is anything wrong...
What I don't understand here is that how is 1/4 accepted, as if x=1/4 then there is a 0 in the denominator which is going to give (Math Error)??  ??? :-\
Thanks!

ShiningStar:

--- Quote from: leebux101 on May 17, 2011, 06:12:51 pm ---may june 2003 Q5 , what are the complex numbers and how to do part i)
please asap! =D thanks a gziliion in advance! =D

--- End quote ---
The complex numbers are: u=2i, w=(cos(2pi/3) + sin(2pi/3)i)
5.i) w= -1/2 + (root3/2)i, what I did is that I solved the brackets where cos(2pi/3) = -1/2 and sin(2pi/3)i = (root3/2) i
uw= 2i(-1/2 + (root3/2)i) = -root3-i
u/w = 2i/(-1/2 + (root3/2)i) then you multiply it by its conjugate (-1/2 - (root3/2)i) to get it in form x+iy
Hope it helps :)

leebux101:
thankyou sooooooooooooooooooooooooooo much!! honestly! =D
i am sorry i cant help u in ur question.. =(

leebux101:
also for same questio  part iii
how do u get the angle at the vertices! please. =)

Navigation

[0] Message Index

[#] Next page

[*] Previous page