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X 2 +6x+___ complete the square
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X 2 +6x+___ complete the square

User Brian Cryer
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1 Answer

2 votes
9 is the blank.

(a+b)^2 = a^2 + 2ab + b^2

a = x
b = 3

(x+3)^2 = x^2 + 6x + 9
User Prehfeldt
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