Question 4. Convert to Vertex form by completing the square and factoring and isolating y. Which is the first step of work where an error is made? *

y=-x^2-6x-8

A. y + 8 = -x^2 -6x

B. -y - 8 = x^2 +6x

C. -y +1 = x^2 + 6x + 9

D. -y + 1 = (x+3)^2

E. -y = (x+3)^2 -1

F. y = (x-3)^2 + 1