Conjugate 9 + -4i and 3 + -7i

a = bi = <-- Enter a and bi piece
c = di = <-- Enter c and di piece (not needed for square root or absolute value or conjugate)

Determine the conjugate for 9 - 4i

The conjugate of a complex number a + bi involves mulitplying the imaginary portion of bi by -1.
Therefore, a + bi has a conjugate of a - bi and a - bi has a conjugate of a + bi.
Conjugate of 9 - 4i = 9 + 4i