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Assume the expression is:

y = x² - 6x + 5

Complete the squares to get:

y = x² - 6x + 9 + 5 - 9

= (x - 3)² - 4

By the vertex form:

y = a(x - h)² + k where x = h is the axis of symmetry

x = 3 is the axis of symmetry.

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