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.

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