For what value of k the quadratic equation x^2 -2(k+1)x+k^2=0 has real and equal roots

For what value of k the quadratic equation x^2 -2(k+1)x+k^2=0 has real

1.	For what value of k the quadratic equation x^2 -2(k+1)x+k^2=0 has real and equal roots
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