Assume we have the product of these terms. Multiply these terms altogether to get 12i². Make note that i = √-1, i² = -1, i³ = -i and i⁴ = 1. Then, 12i² = 12(-1) = -12.
That is the answer to the question.
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Use the Pythagorean theorem. 5, -5, 5i, and -5i will work, as well as any combination of a real and imaginary number such that (real part) squared + (imaginary part) squared = 25, for example, 4 + 3i, 3 + 4i, 4 - 3i, etc.
The complex conjugate of 2-3i is 2+3i.
(x - 4i)(x + 4i) where i is the square root of -1
To get the conjugate simply reverse the sign of the complex part. Thus conj of 7-4i is 7+4i