If the function `x^(2)-2kx + 3` is minimum at x=3 then find the value of k.

Explanation

To solve the problem step by step, we will follow the reasoning laid out in the video transcript.

### Step 1: Define the function
Let the function be defined as:
\[ f(x) = x^2 - 2kx + 3 \]

### Step 2: Find the first derivative
To find the minimum or maximum of the function, we need to calculate its first derivative:
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