Solve by completing the square: k2 − 12k + 23 = 0

The answer to the question is A.

To solve the equation k² - 12k + 23 = 0 by completing the square, we need to using the b value to rewrite the constant which is 12/2 = 6, and square it to obtain 36.

Since we already have 23, then next we need to add 13 (36 - 23) each side, which gave us: k² - 12k + 36 = 13, simplified as (k - 6)² - 13 = 0.

Finally by adding 13 to both sides and taking the square root, we find k = 6 ±

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