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October 21, 2014

October 21, 2014

Posted by **Sally** on Tuesday, May 18, 2010 at 5:12pm.

- Algebra/trigonometry -
**Reiny**, Tuesday, May 18, 2010 at 5:21pmJust expand it

(3-7i)^2

= (3-7i)(3-7i)

= 9 - 42i + 49i^2 , but i^2 = -1

= 9 - 42i - 49

= -40 - 42i

- Algebra/trigonometry -
**Sally**, Tuesday, May 18, 2010 at 5:26pmokay thank you

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