Posted by kim on Saturday, October 31, 2009 at 3:17pm.
rationalize the denominator. I will do one:
(2+i)/(2-i)= 2+i)(2+i)/(2-i)(2+i)=
(2+i)^2/(2-i^2)= (4+4i+i^2)/3
you can complete it.
so is that the final answer
os is the final answer 8i+i^3/3
(2+i)/(2-i)
=(2+i)(2+i)/((2+i)(2-i))
=(4+4i+i²)/(2²-i²)
=(4+4i-1)/(4-(-1))
=(3+4i)/5
You can proceed along the same lines for the first problem.
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