zoobst zoobst 24-06-2021 Mathematics contestada What is the completely factored form of this polynomial? x^4- 8x^2 + 16 A. (X+2)^2(x-2)^2 B. (x^2-4)^2 C. (x^2+4)(x+2)(x-2) D. (x+2)(x-2)