Which of the following Q.E has real and ...

Which of the following Q.E has real and equal roots?

A

`x^2-4x + 4 = 0`

B

`2x^2 - 4x + 3 = 0`

C

`3x^2 - 5x + 2 = 0`

D

`x^2-2sqrt2x-6 = 0`

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