The function f is defined by f : x → 2x

i) Express f(x) in the form a(x + b)2 + c, where a, b and c are constants.

ii) State the value of A for which the graph of y = f(x) has a line of symmetry

I have no clue on how to do (ii). Will appreciated your help!

^{2}− 12x + 13 for 0 ≤ x ≤ A, where A is a constanti) Express f(x) in the form a(x + b)2 + c, where a, b and c are constants.

ii) State the value of A for which the graph of y = f(x) has a line of symmetry

I have no clue on how to do (ii). Will appreciated your help!

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