Wednesday, October 9, 2013

Simplify the complex fraction 8i/(2-2i)?

We'll factorize the denominator by
2:


8i/2(1-i)


We'll simplify by
2:


4i/(1-i)


Since we are not
allowed to keep a complex number at denominator, this one has to be multiplied by it's
conjugate, which in this case is
(1+i).


4i/(1-i)=4i*(1+i)/(1-i)*(1+i)


(4i
+ 4i^2)/(1-i^2)


We know
that i^2=-1


Therefore, the number will
become:


(4i +
4i^2)/(1-i^2)=(4i-4)/(1+1)=4(-1+i)/2


We'll simplify and
we'll get:


4(-1+i)/2 = -2 +
2i


The simplified value of the given fraction
is: 8i/(2-2i) = -2 + 2i

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