Please explain how to find the value for k for which this equation has one repeated root x^2-2x+k=0

Please explain how to find the value for k for which this equation has one repeated root x^2-2x+k=0

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(x-a)(x-a)
x^2-ax-ax+a^2
I don't quite understand how this relates to the problem?

\(x^2-ax-ax+a^2 = \\ x^2 - 2ax + a^2\)
original problem:
\(x^2-2x+k=0\)
geddit?

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