My problem states to factor completely:

49c+56c+16

Nothing can be factored out as it is. So I took the product of 49 & 16 = 784 and two integers whose products equal 784 and sum equals 56 is (28)(28)

Yet when I go to factor, it's not adding up. Maybe I am confusing the steps?

49c^{2}+28c+28c+16

28c(c+21c) ?

I am not sure what I am suppose to do actually...