Express the complex numbers (5i) ( - 3 5 i ) in the form a + ib. - Vidyadip

Question

Express the complex numbers $(5i)\left( { - \frac{3}{5}i} \right)$ in the form a + ib.

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Answer

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

= 3 = 3+0i

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