Tuesday, March 10, 2015

Find the absolute values of z if 2z-i +5 = 3z -3i +1

Given the complex
equation:


2z -i + 5 = 3z -3i
+1


We need to find the absolute value of
z.


First we need to rewrite z into the format of the
complex number z = a+bi


let us combine terms with z on the
left side.


==> 2z -3z = -3i +1 +i
-5


==> -z = -4 -2i


Now
we will multiply by -1


==> z = 4 +
2i


Now we will calculate the absolute
values.


==> l z l = sqrt(a^2 +
b^2)


               = sqrt( 4^2 +
2^2)


               = sqrt(16 + 4) = sqrt20 =
2sqrt5


==> l zl =
2sqrt5

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