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Answer:
(x -7)^2 -9 = 0
Explanation:
To complete the square, add and subtract the square of half the x-coefficient.
x^2 -14x +40 = 0 . . . . given
x^2 -14x +(-7)^2 +40 -(-7)^2 = 0
(x -7)^2 +40 -49 = 0
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