Asked by Skye

factor completely

81x^4 - 81



possible choices are::

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

OR

(9x^2 +9)(3x + 3)(3x - 3)
Answered by Steve
No 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!)
Answered by seng
0968763228