A aricho Member Joined Feb 19, 2006 Messages 147 Gender Male HSC N/A Jan 9, 2007 #1 hey sorry about this question...its holidays and i have forgotten how 2 do it.....and i duno where to start looking in my book....................... express (3-4i)^7 in x+iy form Thanks
hey sorry about this question...its holidays and i have forgotten how 2 do it.....and i duno where to start looking in my book....................... express (3-4i)^7 in x+iy form Thanks
R Riviet . Joined Oct 11, 2005 Messages 5,584 Gender Undisclosed HSC N/A Jan 9, 2007 #2 You could expand it using the binomial theorem or change 3-4i into Rcis@ form and then change it back into x+iy form after expanding.
You could expand it using the binomial theorem or change 3-4i into Rcis@ form and then change it back into x+iy form after expanding.
P pLuvia Guest Jan 9, 2007 #3 Exactly what Riviet said change the cartesian equation into polar form (3-4i)7={5cis(tan-1[4/3])}7 Then change it back to the cartesian form by expanding the cos and sin
Exactly what Riviet said change the cartesian equation into polar form (3-4i)7={5cis(tan-1[4/3])}7 Then change it back to the cartesian form by expanding the cos and sin
