How do you factor completely 81 x^4 - 256? Algebra Polynomials and Factoring Factoring Completely 1 Answer 冠廷 李. Aug 8, 2016 (9x^2+16)(3x+4)(3x-4) Explanation: 3^4x^4-16^2 =(3x)^4-16^2 =(9x^2)^2-16x^2 =(9x^2+16)(9x^2-16) =(9x^2+16)(3x+4)(3x-4) Answer link Related questions What is Factoring Completely? How do you know when you have completely factored a polynomial? Which methods of factoring do you use to factor completely? How do you factor completely 2x^2-8? Which method do you use to factor 3x(x-1)+4(x-1) ? What are the factors of 12x^3+12x^2+3x? How do you find the two numbers by using the factoring method, if one number is seven more than... How do you factor 12c^2-75 completely? How do you factor x^6-26x^3-27? How do you factor 100x^2+180x+81? See all questions in Factoring Completely Impact of this question 1393 views around the world You can reuse this answer Creative Commons License