Question

Thanks!超急,十万火急的急!(2)

Answer 1

设x^2 + x为X

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

=X(X+2)-8

=X^2+2X-8

=(X+4)(X-2)

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

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