What is complex number z if z+3i=6 conjugate z?

### 1 Answer | Add Yours

You need to use the algebraic form of complex number `z = x + y*i` and its conjugate `bar z = x - y*i` , such that:

`z + 3i = 6bar z => x + y*i + 3i = 6(x - y*i)`

`x + y*i + 3i = 6x - 6y*i => x - 6x + i*(y + 3 + 6y) = 0`

`-5x + i*(7y + 3) = 0 + 0*i`

Equating the real parts and imaginary parts yields:

`{(-5x = 0),(7y + 3 = 0):} => {(x = 0),(y = -3/7):}`

**Hence, evaluating the complex number z, under the given conditions, yields **`z = 0 - (3/7)*i.`

### Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes