Question
Show that $x $ is rational, if $x^2 = 0.0004.$

Answer

$ x^2=0.0004 $
$ x=\frac{0.0004}{10000} $
$ x=\sqrt{\frac{4}{10000}} $
$ x=\frac{2}{100} $
$x=0.02$
It is a Rational.

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