Question

What are the coordinates of the vertex for f(x) = x2 + 6x + 13?

A. (4, 4)
B. (−4, 4)
C. (3, 4)
D. (−3, 4)


Which of the following is a factor of 5x3 + 320?
A. 5
B. x+4
C. x^2-4x+16
D. All of the above

Answer 1

x2 + 6x + 13
c = (b/2)2 = (6/2)2 = 9
x2 + 6x + 9 + 4
(x+3)2 +4
so the vertex is at: (-3, 4), D)