Answer:
B
Explanation:
Given
x² - 6x - 14 = 0 ( add 14 to both sides )
x² - 6x = 14
Use the method of completing the square on the left side of the equation
add (half the coefficient of the x- term )² to both sides
x² + 2(- 3)x + (- 3)² = 14 + (- 3)²
x² - 6x + 9 = 14 + 9 ← left side is a perfect square, hence
(x - 3)² = 23 → B