1.

If iz3 + z2 - z + i = 0, then |z| is:1. 12. ±13. 04. -1

Answer» Correct Answer - Option 1 : 1

Concept:

If z = a + ib, then |z| = \(\rm \sqrt{a^2 + b^2}\)

 

Solution:

The given equation can be solved as:

iz3 + z2 - z + i = 0

⇒ iz3 + i2z + z2 + i = 0

⇒ iz(z2 + i) + (z2 + i) = 0

⇒ (z2 + i)(zi + 1) = 0

⇒ z2 + i = 0 OR zi + 1 = 0

⇒ z2 = -i OR z = i

|z| = 1 in both the cases.



Discussion

No Comment Found

Related InterviewSolutions