STEP 1: Recall what is symmetry
https://www.learner.org/courses/learningmath/geometry/session7/part_a/index.html
The graph of a quadratic function is a parabola. The axis of symmetry of a parabola is a vertical line that divides the parabola into two congruent halves. The axis of symmetry always passes through the vertex of the parabola. The x
x -coordinate of the vertex is the equation of the axis of symmetry of the parabola.The axis of symmetry is given by the formula x = -\frac{b}{2a}
STEP 2: Find the axis of symmetry of y = x^{2}-4x + 2
Since the axis of symmetry is at x = -\frac{b}{2a},
plugging in the values of a = 1, b = -4 we get x = -\frac{-4}{2} = 2
https://www.varsitytutors.com/hotmath/hotmath_help/topics/axis-of-symmetry-of-a-parabola
