Homework Help: Algebra

Posted by Corinna on Saturday, October 10, 2009 at 2:47pm.

I have to rationalize the denominator of 2+3i/1+2i. I multiplyed this expression by 1-2i/1-2i, resulting in 2+4i+3i+-6i^2/1+-2i+2i+-4i^2. It then became 2+2i+3i+6/1-1+2i+3. Is this right? Thanks!

Algebra - Reiny, Saturday, October 10, 2009 at 2:55pm
After multiplying I got
(2 - 4i + 3i - 6i^2)/(1 - 4i^2)
= 2 -i + 6)/(1 + 4)
= 8-i)/5

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