Tuesday

September 2, 2014

September 2, 2014

Posted by **Skye** on Monday, June 2, 2014 at 7:41pm.

81x^4 - 81

possible choices are::

(9x^2 + 9)(9x^2 - 9)

OR

(9x^2 +9)(3x + 3)(3x - 3)

- math -
**Steve**, Monday, June 2, 2014 at 10:23pmNo reason to stop there. Factor out all those 3's:

81(x^2+1)(x-1)(x+1)

If you must pick one of those choices, then use the last one, since it factors the 9x^2-9 as well. (factor completely!)

- math -
**seng**, Tuesday, June 10, 2014 at 10:51am0968763228

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