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January 29, 2015

January 29, 2015

Posted by **Nathan** on Monday, April 9, 2012 at 9:34am.

9x^2 + 49

- Math -
**Reiny**, Monday, April 9, 2012 at 10:01amhow about ...

(3x + 7i)(3x - 7i) ?

check:

(3x + 7i)(3x - 7i)

= 9x^2- 49i^2, but i^2= -1

= 9x^2 - 49(-1)

= 9x^2 + 49

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