Q

# Express each of the complex number in the form a+ib. (1) (5i)(-3/5 i)

Express each of the complex number in the form  $a+ib$ .

Q : 1        $(5i)\left ( -\frac{3}{5} i\right )$

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On solving

$(5i)\left ( -\frac{3}{5} i\right )$
we will get

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

Now, in the form of   $a+ib$   we can write it as
$= 3+0i$

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