If √x = x, then which of the following must be true?  Choose the correct answer
A) x is positive
B) x=1
C) x^2>x
D) x is non-negative
E) None of the above
Square both the sides we get   x = x^2   x^2 - x= 0   x(x-1)=0   either x=0 or x=1   So, answer will be x is non-negative
<result>D</result>
If √x = x, then which of the following must be true?