49c^2 is one term, and so can not be factored. However, it can be square-rooted to "7c".
No.
No.
It is 2401c2.
The GCF is 7mn.
The GCF is 4.
9xy(3xy - 4)
(5x - 2y)(5x + 2y)
52 is not a factor of 325. 5 squared is a factor of 325.
(x)(x)
49c
(a + x^2)(b + y^2)
6xyz(3x + 2y + z)