y=x2-4x=1

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I think you meant to type y = x^2 - 4x + 1.To find the axis of symmetry of a quadratic equation, you only need to find the x-value of the vertex. To find the x of the vertex, use the formula:-b2awhere b and a are found in the standard form of a quadratic equation (y = ax^2 + bx + c)We substitute -4 for b and 1 for a, and so we get:- (-4)2 (1)42 = 2The x-value of the vertex is 2, so you only need to write the axis of symmetry. The axis is represented as a line, so you have to write your answer in the form of x = 2 (i.e. a vertical line with an undefined slope), *not* just 2.~ Azaler