It is -4+7i or +4-7i. All that is required is to change one of the signs, it does not matter which.
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"Conjugate" usually means that in one of two parts, the sign is changed - as in a complex conjugate. If the second part is missing, the conjugate is the same as the original number - in this case, 100.
The conjugate of 2 + 3i is 2 - 3i, and the conjugate of 2 - 5i is 2 + 5i.
The complex conjugate of 2-3i is 2+3i.
8i
0 + 5i Its complex conjugate is 0 - 5i