goldfish4420 goldfish4420

24-02-2018
Mathematics

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

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SilverSister SilverSister

24-02-2018

81 because (a + b)^2 = a^2 + 2ab + b^2
Thus x^2 + 2(9)(x) + (9)^2 = x^2 + 18x + 81

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