Đáp án:

Giải thích các bước giải:

`22. (x^2+3x+1)(x^2+3x-3)-5`

`=(x^2+3x-1+2)(x^2+3x-1-2)-5`

`=(x^2+3x-1)^2-2^2-5`

`=(x^2+3x-1)^2-9`

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

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

`23.` Xem lại đề.

`24.` `6a^4+7a^3-37a^2-8a+12`

`=6a^4-12a^3+19a^3-38a^2+a^2-2a-6a+12`

`=6a^3(a-2)+19a^2(a-2)+a(a-2)-6(a-2)`

`=(a-2)(6a^3+19a^2+a-6)`

`=(a-2)[3a^2(2a-1)+11a(2a-1)+6(2a-1)]`

`=(a-2)(3a-1)(3a^2+11a+6)`

`=(a-2)(3a-1)[a(3a+2)+3(3a+2)]`

`=(a-2)(3a-1)(3a+2)(a+3)`