Write the quadratic equation function in the form : a(x-h)^2+k

f(x)=x^2-4x+9

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This is related to completing the square of quadratic equations.

`f(x)=x^2-4x+9`

`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**

**Sources:**

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