Question

Can the expression be factored furthered? show your work.(x2 + 4) (x2 -4)

Answer 1

$(x^2 + 4) (x^2 -4) =\\ (x^2+4)(x-2)(x+2)$

Answer 2

Yes.The second factor is the difference of 2 squares,
so the second factor alone becomes

(x² - 4) = (x + 2) (x - 2)