Question

Please explain how I solve these I'm confused !

1. Which equation represents the axis of symmetry of the function y = –2x² + 4x –6? (1 point)
a. y = 1
b. x = 1
c. x = 3
d. x = –3

2.What are the coordinates of the vertex of the graph of the function y = –x² + 6x –11?
a. (3, –2)
b. (3, 16)
c. (–3, –29)
d. (–3, –20)

3.What are the coordinates of the vertex of the graph of the function y = –3x² –12x + 3?
a. (–2, 29)
b. (2, –15)
c. (2, –9)
d. (–2, 15)