General

MCQ - 2-8734

Question:

Find the product of the complex number and its conjugate. $4 + 2 i$

$12 i^{2}$
$20 - 16 i$
20
$20 - 16 i$

Correct Answer: C

Explanation:

$(4 + 2 i) (4 - 2 i)$ $16 - 8 i + 8 i - 4 i^{2}$

16 + 4
20

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