=x^2(x^2-2x-48)

=x^2(x-8)(x+6)

10.

=(x^2+2x)^2+x^2+2x-6-6

=(x^2+2x)^2+x^2+2x- 12

=(x^2+2x+4)(x^2+2x-3)

=(x^2+2x+4)(x+3)(x- 1)

1 1.

=(x+ 1)(x+4)(x+2)(x+3)-3

=(x^2+5x+4)(x^2+5x+6)-3

=(x^2+5x)^2+ 10(x^2+5x)+24-3

=(x^2+5x)^2+ 10(x^2+5x)+2 1

=(x^2+5x+3)(x^2+5x+7)