The vertex is the minimum/maximum point of the parabola.
This parabola has a dip, minimum point.
Looking at the coordinates, the vertex is at:
Vertex = (1,1)
The axis of symmetry is always the x-coordinate of the vertex coordinate.
That is x = 1.
So,
Axis of Symmetry:
x = 1
Now,
Since x = 1 (vertical line) is the axis of symmetry, we reflect the points P and Q about this line and find the points P' and Q'.
P' = (2,2)
Q' = (-1,5)