Test 4 Section 3 #14
When you’re dividing complex numbers, you have to multiply the top and bottom of the fraction by the complex conjugate of the bottom. This creates a real number in the bottom of the fraction, which is awesome.
The bottom of this fraction is , so its complex conjugate is . To get started, then, we write the following:
Then we simplify as much as we can. First we FOIL:
Now, remembering that and therfore that , we make that substitution and simplify further:
So there you have it. Once we simplify that complex fraction into form, we see that it’s just , which means .