Which zero pair could be added to the function so that the function can be written in vertex form?

A. 3, - 3

B. 6, - 6

C. 9, - 9

D. 36, - 36

The function in this problem should be: f (x) = x ² + 12x + 6

y = x ² + 12x + 6

y - 6 = x² + 12x

x² ⇒ x * x

12x ⇒ 2*6*x

missing number is 6² = 36

y - 6 + 36 = x² + 12x + 36

(x+6) (x+6) ⇒ x (x+6) + 6 (x+6) ⇒ x² + 6x + 6x + 36 = x² + 12x + 36

y + 30 = x² + 12x + 36

y = (x+6) ² - 30

Choice is D. 36,-36