goldfish4420 goldfish4420
  • 24-02-2018
  • Mathematics
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Which number completes the square? x2 + 18x + _____?

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SilverSister
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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