Fill in the blank with a constant, so that the resulting quadratic is the square of a binomial: x^2 + 4x + ___
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\(a^2+2ab+b^2=(a+b)^2\)
\(x^2 + 4x\ + \color{blue}2^2 = (x+ 2)^2\)
\(x^2 + 4x\ + \color{blue}4\ = (x+ 2)^2\)
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