Add the Proper Constant to Each Binomial So That the Resulting

Add the proper constant to each binomial so that the resulting trinomial is a perfect square trinomial. Then factor the
trinomial.
- $x ^ { 2 } + 6 x +$ ________

A) $x ^ { 2 } + 6 x + \underline { 6 } = ( x + 36 ) ^ { 2 }$
B) $x ^ { 2 } + 6 x + 9 = ( x + 3 ) ^ { 2 }$
C) $x ^ { 2 } + 6 x + \underline { 3 } = ( x + 9 ) ^ { 2 }$
D) $x ^ { 2 } + 6 x + \underline { 36 } = ( x + 6 ) ^ { 2 }$

Correct Answer:

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