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Which number completes the square? x2 + 18x + _____?
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2 votes
Which number completes the square? x2 + 18x + _____?

User Yuanyuan
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81 because (a + b)^2 = a^2 + 2ab + b^2
Thus x^2 + 2(9)(x) + (9)^2 = x^2 + 18x + 81
User Andy Lobel
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