Question

What is the conjugate of the complex number 6 + 12i?

• A. – 6 + 12i
• B. 12i
• C. – 6 – 12i
• D. 6 – 12i

Answer 1

The correct option is D

6 – 12i

Conjugate of a complex number is obtained by reversing the sign of the imaginary part of the complex. The real part is left unchanged. Hence complex conjugate of a + bi is a – bi and vice versa. Here reversing the sign of the imaginary part in the complex number 6 + 12i gives its complex conjugate 6 - 12i.