(p - k)(p + k) (6x - 5y)(6x + 5y) (p2 - q)(p² + q) (x - y)(x + y) (4x + 3y)(4x - 3y) (p³ - q²)(p³ + q2) (y - k)(y + k) (7p - 2k)(7p + 2k) (m - n³)(m + n³) (m - n)(m + n) (8y - 3p)(3p + 8 y) (x6+y³)(x6 - y³) (c - 2)(c + 2) (6x - 2y)(6x + 2y) (-x5 + y²)(y2 + x5) (k + 5)(k - 5) (7p+9q)(7p-9q) (p7 - q6)(p7+q6) (m + 6)(6 - m) (11x+12y)(11x - 12y) (2p2 - 3q)(2p2+3q) (0,3 - p)(0,3 + p) (0,1x+6)(0,1x - 6) (1,2x4 - 3y5) (1,2x4 + 3y5) (2x - 1)(2x+1) (0,6p2c)(0,6p+2c) (1,1x7 - 4y³) (1,1x7 + 4y3) (3p - k)(3p + k) (1,3x+3y)(1,3 - 3y) (10x2 - 13y8) (10x2 + 13y8) (7-p)(7 + p) (0,9-4y)(0,9 + 4y) (20x6 + 7y4) (20x6 - 7y4) (2c+1)(2c - 1) (5-0,8t)(5+0,8t) (30x5 - 9y2) (30x5 + 9: (3t - y)(y + 3t) (1,4b6c)(1,4b + 6c) (1,4x4 - 8y6) (1,4x4 + 8y,