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gogolik [260]
3 years ago
6

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

Mathematics
1 answer:
yuradex [85]3 years ago
8 0
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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