1 . 3a+ib=x+iy

• A. $2\left(x^2-y^2\right)$
• B. $2\left(x^2+y^2\right)$
• C. $-2\left(x^2+y^2\right)$
• D. $2\left(y^2-x^2\right)$

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Answer: Option D

Explanation: