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Write it in that nice quadratic form first of all! c:
\[x^2 -4x + 4 = 0\]
then lets see.. hmmmm

looks like it is a nice perfect square, doesn't it? c: do ya see it?? :D

yeh

but what does that mean?

so would it be A?

ya that sounds right c: x=2 is the only solution

(x-2)(x-2)=0
x=2 :)