Question 56864
a) {{{sqrt(x-2)=1}}}

    Now multiply at both sides to obtain:

    {{{(sqrt(x-2))^2=1^2}}}

This means that x-2 = 1, so x = 3


b) The only x that satisfies is x=3, try it!

c){{{9=3*sqrt(x^2)=3*x}}}

   So  3*x = 9 => x=3