Answer:
x = 3
Explanation:
given a parabola in standard form : y = ax² + bx + c : a ≠ 0
Then the equation of the axis of symmetry is
x = -

y = x² - 6x +
is in standard form
with a = 1 and b = - 6, hence
x = -
= 3
equation of axis of symmetry is x = 3