Let x 4+x 2 = y

(y-4)(y+3)+ 10

=y^2+3y-4y- 12+ 10

=y^2-y-2

=(y+ 1)(y-2)

=(x^4+x^2+ 1)(x^4+x^2-2)

=(x^4+x^2+ 1)(x^2- 1)(x^2+2)

=(x^4+x^2+ 1)(x+ 1)(x- 1)(x^2+2)

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