Answer:
D.
Explanation:
x^2-14x+49=(x-7)^2
x^2 -14x +49
( x-7)^2
x^2 -14x
We are completing the square
Take the coefficient of x
-14
Divide by 2
-14/2 = -7
Square it
(-7)^2 = 49
Add it
Take the -7
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