How to solve these two math problems? PLEASE.

Factor by grouping..

7z² + 14z - az - 2a


5m - 6p - 2mp +15

7z² + 14z - az - 2a = (7z^2 +14z) - (az + 2a)
=> 7z (z + 2) - a(z + 2)
=> (z + 2) (7z - a)


5m - 6p - 2mp +15 = (5m - 2mp) - (6p - 15)
=> m (5 - 2p) + 3 ( 5 - 2p)
=> (5 - 2p) (m + 3)

(7z² + 14z) -(az +2a) = 7z(z+2) - a(z+2) = (z+2)(7z -a)

(5m +15 ) - (6p +2mp) = 5(m+3) - 2p(3+m) = (m+3)(5-2p)

(z + 2)(7z - a)

(m + 3)(5 - 2p)