Answer: C) 15
Good luck !
Answer:
5,8,13,20
Step-by-step explanation:
f(n)=n²+4
f(1)=1²+4=1+4=5
f(2)=2²+4=4+4=8
f(3)=3²+4=9+4=13
f(4)=4²+4=16+4=20
The vertex is (-1, 2).
The equation of parabola:
where (h, k) is the vertex
We have h = -1 and k = 2.
Substitute:
