1. ab+4a-3b-12
2. x^2-4x-21
3. 10y^2-7y-6
4. 16m^3-24m^2+24m-36
5. 6a^2-23ab+7b^2
6. 16x^4-12x^3+2x^2
1. ab+4a-3b-12
2. x^2-4x-21
3. 10y^2-7y-6
4. 16m^3-24m^2+24m-36
5. 6a^2-23ab+7b^2
6. 16x^4-12x^3+2x^2