factorize 問題..please help help me!!

1.) 6p^2 - 25pq + 14q^2
=(2p-7q)(3p-2q)

2.) 12c^2+40cd+25d^2
=(6c+5d)(2c+5d)

1.) 6p^2-25pq+14q^2
=(2p)(3p)-25pq+(-7q)(-2q)................................a^2-2ab+b^2=(a-b)(a-b)
=(2p-7q)(3p-2q)

2.) 12c^2+40cd+25d^2
=(2c)(6c)+40cd+(5d)(5d)................................a^2+2ab+b^2=(a+b)(a+b)
=(2c+5d)(6c+5d)

6p^2-25pq+14q^2
=( 3p-2q) (2p-7q)

12c^2+40cd+25d^2
= (2c-5d) (6c-5d)

2006-12-13 22:03:05 補充：
type it wrongly, the answer for Q.2 should be (2c+5d) (6c+5d)

1.) 6p^2 - 25pq + 14q^2
=(2p-7q)(3p-2q)

2.) 12c^2+40cd+25d^2
=(2c+5d)(6c+5d)