1. Factorize the following Binomials (i) 3x + 21 (ii) 7a – 14 (iii) b 3 + 3b (iv) 20a + 5a 2 (v) – 16m + 20m 3 (vi) 5a 2 b + 15ab 2 (vii) 9m 2 + 5m (viii) 19x – 57y (ix) 25x 2 y 2 z 3 – 15xy 3 z