$(5 i) (- \frac{3}{5} i)$

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Solution

$(5 i) (- \frac{3}{5} i) = - 5 \times \frac{3}{5} i^{2} = - 3 (- 1) = 3$

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∣ ∣ ∣ ∣ ∣ \begin{matrix} - 5 & 3 + 5 i & \frac{3}{2} - 4 i 3 - 5 i & 8 & 4 + 5 i \frac{3}{2} + 4 i & 4 - 5 i & 9 \end{matrix} ∣ ∣ ∣ ∣ ∣

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