For any integer n0 find solutions to Can you solve this by u
For any integer n>0, find solutions to:
Can you solve this by using polar coordinates? thank you!
For any integer n>0, find solutions to: z^n = 1 Solve this by using polar coordinates?Solution
Consider the equation : zn = 1
To solve this equation,we use polar representation for both sides,
setting z = rei on the left, and using all possible polar angles on the right;
using the exponential law to multiply , the above equation then becomes rnein = 1.e2ki , k = 0,±1,±2,±3,...
Equating the absolute values and the polar angles of the two sides gives rn = 1 and n = 2k , k = 0,±1,±2,±3,...
from which we conclude that rn = 1 and = 2k/n ; for n = 0,1,2,3,...,(n-1)
In the above,we get only the value r = 1, since r must be real and non negative.
Thus , we conclude that , the nth root of 1 are the numbers e2ki/n for k = 0,1,2,...,(n-1)
