Fill in the blanks to write this quadratic as the square of a binomial.
x^2 + 4x + ___
To get +4x and be the square of some binomial, we can just square (x+2)
Therefore it would be (x+2)^2
This simplifies to x^2 + 4x + 4
So the answer would be 4.
(Please tell me if I am wrong)