When finding the conjugate of a binomial, you just reverse the sign. So the conjugate of 3+4i is 3-4i.
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-6-4i.
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.
√-48 + 35 + √ 25 + √-27 = √[(i2)(16)(3)] + 35 + 5 + √[(i2)(9)(3)] = 4i√3 + 38 + 9i√3 = 38 + (13√3)i
(7 + 3i) + (8 + 9i) = (7 + 8) + (3i + 9i) = (7 + 8) + (3 + 9)i = 15 + 12i Which can also be written as: 15 + 12i = 3(5 + 4i).
The concept of conjugate is usually used in complex numbers. If your complex number is a + bi, then its conjugate is a - bi.