f(x) = −x^2 + 6x + 4

f(x) = −x^2 + 6x + 4 + 9 - 9

f(x) = −x^2 + 6x - 9 + 9 + 4

f(x) = −(x^2 - 6x + 9) + 9 + 4

f(x) = −(x - 3)^2 + 13

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