Which of the following is the conjugate of 6 + 7i?

Solution:

Conjugate of a real number has no physical significance. Conjugate is defined for complex numbers, mostly.

A conjugate of a complex number means the complimentary of a complex number, such that when the complex and its conjugate are added, it results in the twice of the real part, and the imaginary part gets canceled.

In other words, a conjugate means just changing the sign of the imaginary part of the complex number.

Therefore, the conjugate of 6 + 7i is 6 - 7i.

Which of the following is the conjugate of 6 + 7i?

Summary:

Conjugate of 6 + 7i is 6 - 7i.