Which of the following polynomials can't be factored in real numbers?
Multiple choice question from an old test.
Got the following polynomials:
$x^8$
$(x-3)(x^2+x+1)$
$(x-2)^3(x^2-1)$
$x^8(x^2-1)$
$(x^2-1)^3$
$x(x-1)(x+1)$
Solution:
Solving $x^2+x+1$ isnt possible with real numbers hence D is negative?
There for answer must be
$(x-3)(x^2+x+1)$
Edited right answer.