If we express $x^2 + 4x + 5$ in the form $a(x - h)^2 + k$, then what is $h$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If we express $x^2 + 4x + 5$ in the form $a(x - h)^2 + k$, then what is $h$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-2
If we express $x^2 + 4x + 5$ in the form $a(x - h)^2 + k$, then what is $h$?
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