Question

Which of the following is the conjugate of a complex number with 2 as the real part and 7 as the imaginary part?

a. 2 + 7i
b. -2 - 7i
c. -2 + 7i
d. 2 - 7i

Answer 1

2-7i is the correct option.

Explanation:

We have been given the complex number real part 2 and imaginary part 7 it can be expressed as:

2+7i

And the conjugate means in the complex number is opposite sign of imaginary part that is in general:

a+ib will have conjugate a-ib

So, the conjugate of 2+7i is 2-7i

Hence, Option d is correct.