0 + 5i
Its complex conjugate is 0 - 5i
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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.
The standard form of a complex number is a+bi. So the standard form of the negative square root of 5i is 0-√(5i).
The idea here is to change the sign before the imaginary term. In this case, since there is a minus, you change it to a plus.
Welcome to the world of imaginary and complex numbers. i is defined to be a number such that i2 = -1. i is imaginary ( that is not real) 5i is i+i+i+i+i . There is no simpler form than 5i . Please see the attached link for more about imaginary numbers.