Question

Factor the expression. c2 + 4c + 4 A. (c + 2)2 B. (c + 1)(c + 4) C. (c2 + 4)2 D. The expression cannot be factored because it is prime.

Answer 1

c^2+4c+4= (c+2)(c+2) or =(c+2)^2   choice A

how do you know that?
you have a perfect square in your expression, to find out the term, you asked yourself the question what two numbers add to be 4 and multiply to be 4, the answer is 2