Thread: Multiplication of complex exponential numbers

(625e^(3.46i))*(4.4e^(1.22i))

when i multiply it out i get 2750e^(4.2212i) From there I'm supposed to make it into polar and rectangular forms. the answers in the book are 2750(cos268.1 degrees + i*sin268.1 degrees) for polar form and -89.1 -2750i for rectangular form. Both my answers were incorrect according to the book. So my multiplication must have been off, if anyone can check it for me please.

Originally Posted by OzzMan

(625e^(3.46i))*(4.4e^(1.22i))

when i multiply it out i get 2750e^(4.2212i) From there I'm supposed to make it into polar and rectangular forms. the answers in the book are 2750(cos268.1 degrees + i*sin268.1 degrees) for polar form and -89.1 -2750i for rectangular form. Both my answers were incorrect according to the book. So my multiplication must have been off, if anyone can check it for me please.

First not , so you should have: since:



and radian is degrees (rounded to that precission).

Of course you should also know that:



RonL

woops i multiplied exponents.