-6-4i.
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When finding the conjugate of a binomial, you just reverse the sign. So the conjugate of 3+4i is 3-4i.
The additive inverse of 6+4i is -6-4i since their sum is 0. It is analogous to real numbers where the additive inverse of 6 is -6 since 6+-6 =6-6=0 In the case of complex numbers, we add them by adding the real parts and then adding the imaginary parts. So to find the complex additive inverse of a+bi, we find the inverse of a which is -a and of bi which is -bi and so the additive inverse is -a-bi
Add the real and the imaginary parts separately.
A product is a binary operatoin. That is, it requires two numbers to be combined. There is only one number, 2 + 4i, in the question.
The concept of conjugate is usually used in complex numbers. If your complex number is a + bi, then its conjugate is a - bi.