(a−b−c)(x−y). (a−b−2c)(a−b). [2]Exercise33. (2+x)(2−x). (3+x)(3−x). (3a+x)(3a−x). (5+x)(5−x). (5x+a)(5x−a). (4a2+11)(4a2−11). (11a2+4)(11a2−4). (2ab+cd)(2ab−cd). (1+xy)(1−xy). (9xy+1)(9xy−1). (7ab+2)(7ab−2). (5a2b2+3)(5a2b2−3). (3a4b3+4x5)(3a4b3−4x5). (12xy+1)(12xy−1). (10x3yz2+1)(10x3yz2−1). (1+11a2b4c6)(1−11a2b4c6). (5a+8x3y3)(5a−8x3y3). (4x8+5y9)(4x8−5y9). 90,000. 22,760. 732,200. 400. 28,972.