Question

Express the given complex number in the form $a + ib : (5i)(-\dfrac{3}{5i})$

Answer 1

$a + ib : (5i)(-\dfrac{3}{5i})$

$(5i)(- \dfrac{3}{5})=-5 ×(- \dfrac{3}{5}) × i × i$
$=-3i^2$
$=-3(-1)$
[ As $i^2=-1$]
$=3$