Question

Resolve into factors:
(1). 7a - 3b + 21ab - 1
(2). 6zx - 12yz -11x + 22y
(3). 2p + 3q - 2rq - 2rq - 3p + 2rp
(4). 8mp + 6np - 2p + 20m + 15n - 5

Answer 1

Maybe wrong
Hope it helps

Answer 2

Factorisation

(1) 7a - 3b + 21ab - 1

       = 7a - 1 + 21ab - 3b

       = 1(7a - 1) + 3b(7a - 1)

       ⇒ (1 + 3b) (7a - 1)

(2) 6zx - 12yz -11x + 22y

      = 6z(x - 2y) - 11(x - 2y)

      ⇒ (6z - 11) (x - 2y)

(3) 2p + 3q - 2rq - 2rq - 3p + 2rp

    Sorry... Don't know the answer.

(4) 8mp + 6np - 2p + 20m + 15n - 5

      = 2p(4m + 3n - 1) + 5(4m + 3n - 1)

      ⇒ (2p + 5) (4m + n - 1)

HOPE IT HELPS ...