Wednesday, March 11, 2015

How can we simplify (2+3i)(1-i)/(3-3i)?

Given the complex
number:


(2+3i)(1-i)/(3-3i)


First
we will simplify the numerator by opening the
brackets.


==> (2+3i)(1-i) = 2 - 2i + 3i
-3i^2


But i^2 = -1


==>
(2+3i)(1-i) = 2 +i +3 = 5+i


==>
(5+i)/(3-3i)


Now we will multiply numerator and denominator
by (3+3i)


==> (5+i)(3+3i)/(3-3i)(3+3i) =
(15+15i+3i+3i^2)/(9+9)


                                             =
(12+18i) / 18


                                             
= 12/18 +
i


                                               = 2/3 +
i


==> Then the value of
(2+3i)(1-i)/(3-3i) can be simplifies into the form (2/3) +
i

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