Resolve into factors: a3−7a. 3a2b2−2a3b+3ab3. (a−b)2+(a−b). (a+b)2−1. a3+8b3. (x2−4y2)+(x−2y). (a3−b3)+(a−b). a2−6ab+9b2. x2−x−2. x2−2x−3. x2+4x−21. a2−11a−26. ax2+bx2+3a+3b. x2−3x−xy+3y. x2−7x+12. a2+5ab+6b2. x4+10x2+25. x2−18x+81. x2−21x+110. x2+19x+88. x2−19x+88. x3−x2+x−1. 9x4−x2.