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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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