x2y+2xy2−y3. a5+a4b2+a2b3. x2y2−2xy3+y4. 15a4b4−20a3b5+5a5b3. 3a2x2y2−9a2xy4+3a2y6. x15y2−x13y5−x6y12. 4x5y3−6x4y5+4x3y6. a10x5y10−a9x4y9−a8x3y8. 15a4b5−10a3b6+25a5b4. [2]Ejercicio 22. x2+13x+42. x2−x−42. x2+x−42. x2−13x+42. x2+3x−40. 4x2+12x+9. 4x2−12x+9. 4x2−9. −9x2+12x−4. 20x2−47x+21. a2+ab−6b2. a2−12ab+35b2. 25x2−30xy+9y2. x2−bx−cx+bc. 8m2−10mp+3p2. a2+ab−bc−c2.