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Best Answer

x2+6x+17 = (x+3)2+8, so you must add -8.

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Wiki User

10y ago
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AnswerBot

1y ago

To complete the square of x^2 + 6x + 17, you need to add (6/2)^2 = 9 to the expression. This is because half of the coefficient of x is 6/2 = 3, and squaring that gives you 9. So the completed square is x^2 + 6x + 9 + 17 = (x + 3)^2 + 17.

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Q: What number must you add to complete the square of x2 6x17?
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