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x^2=4x --> x=+/-(2)sqrt(x) --> sqrt(x)=+/-2 (dividing both sides with sqrt(x)) --> x=4 in both cases ie.sqrt(x)=2 or sqrt(x)=-2
x^2=4x implies x*x=4x, cancelling x on both sides u get x=4(can we do this way -if yes answer is A)