Question

The vertex of the function’s graph is given. Find c.

y = c - x2 - 2x; (-1, 3)
a. 5 c. -3
b. -2 d. 2

Answer 1

d. Just substitute x=-1 and y=3 into the eqn

Answer 2

3 = c - (-1)^2 - 2(-1)
3 = c - 1+2
3= c +1
c=2