Răspuns:
Explicație pas cu pas:
(3 - x)(x + 3) - (4 - x)^2 =
(3 - x)(3 + x) - (16 - 8x + x^2) =
9 - x^2 - 16 + 8x - x^2 =
-2x^2 + 8x - 7
_____________
x^16 - 1 = (x^8 + 1)(x^8 - 1) = (x^8 + 1)(x^4 + 1)(x^4 - 1) =
(x^8 + 1)(x^4 + 1)(x^2 + 1)(x^2 - 1) = (x^8 + 1)(x^4 + 1)(x^2 + 1)(x + 1)(x - 1) = 5 factori