Answer:
The answer is (x+2)^2
Step-by-step explanation:
Step 1: Use the commutative property (meaning it can be moved or swapped from its position without making any difference to the answer).
x^2+4x+4
Step 2: Using x^2+4x+4 as a factor of the expression.
x^2+4x+4 = (x+2)^2
