Question 999507


{{{X^4-11x^2+28}}}

{{{x^4-7x^2-4x^2+28}}}

{{{x^2(x^2-7)-4(x^2-7)}}}


{{{(x^2-4)(x^2-7)}}}

{{{(x+2)(x-2)(x+sqrt(7))(x-sqrt(7))}}}