Question 672929


{{{x^4+5x^2-6}}}...replace {{{5x^2}}} with {{{-x^2+6x^2}}}


{{{x^4-x^2+6x^2-6}}}


{{{(x^4-x^2)+(6x^2-6)}}}


{{{x^2(x^2-1)+6(x^2-1)}}}


{{{(x^2+6)(x^2-1)}}}


{{{(x^2+6)(x-1)(x+1)}}}