quick question (1 Viewer)

[aricho]

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

 

[Riviet]

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.

 

[pLuvia]

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