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January 30, 2015

January 30, 2015

Posted by **Michael** on Monday, April 30, 2012 at 10:31pm.

- math -
**MathGuru**, Tuesday, May 1, 2012 at 6:13pmFirst, multiply both the numerator (top) and denominator (bottom) by the equivalent of 1 to eliminate i in the denominator:

(5 - 9i)(5 - 2i)

----------------

(5 + 2i)(5 - 2i)

25 - 55i + 18i^2

----------------

25 - 4i^2

Remember that i^2 = -1

25 - 55i + 18(-1)

-----------------

25 - 4(-1)

25 - 55i - 18

-------------

25 + 4

7 - 55i

-------

29

You can change this to standard form if asked to do so.

I hope this helps.

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