This is related to completing the square of quadratic equations.
`f(x) = x^2-4x+4+5`
`f(x) = (x^2-4x+4)+5`
`f(x) = (x-2)^2+5`
This will look in the form of a(x-h)^2+k.
a = 1
h = 2
k = 5
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