Complex Numbers 2 Question 41

42. Find all non-zero complex numbers z satisfying z¯=iz2.

(1996, 2M)

Show Answer

Solution:

  1. Let

z=x+iy.z¯=iz2(x+iy)=i(x+iy)2xiy=i(x2y2+2ixy)xiy=2xy+i(x2y2)

 Given, 

NOTE It is a compound equation, therefore we can generate from it more than one primary equations.

On equating real and imaginary parts, we get

x=2xy and y=x2y2x+2xy=0 and x2y2+y=0x(1+2y)=0x=0 or y=1/2

When x=0,x2y2+y=00y2+y=0

y(1y)=0y=0 or y=1

When, y=1/2,x2y2+y=0

x21412=0x2=34x=±32

Therefore, z=0+i0,0+i;±32i2

z=i,±32i2



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक