Question

Which of the following expressions is the conjugate of a complex number with −5 as the real part and 4i as the imaginary part?. . 5 + 4i . . 5 − 4i . . −5 − 4i . . −5 + 4i . . i will reward a medal

Answer 1

The complex conjugate of a number will have the original real and imaginary parts retained, but the symbol found in the middle of both parts will be changed, either from a negative sign to a positive sign, or the other way around. Since we are given: -5 + 4i, the complex conjugate will be -5 - 4i.