Question

x^4 -x^2-12 in factoring?
please help

Answer 1

\[\Large x^4 -x^2-12\]


\[\Large x^4 -4x^2+3x^2-12\]


\[\Large (x^4 -4x^2)+(3x^2-12)\]


\[\Large x^2(x^2 -4)+3(x^2-4)\]


\[\Large (x^2+3)(x^2 -4)\]


\[\Large (x^2+3)(x -2)(x+2)\]


So \[\Large x^4 -x^2-12\] completely factors to \[\Large (x^2+3)(x -2)(x+2)\]

Answer 2

thanks