Question

square root of a-6=3

Answer 1

\[\sqrt {a-6} = 3\]

it looks like this, isn't it?

Answer 2

\[\sqrt{a-6} = 3\]
\[a-6 =3^2\]
\[a-6 = 9\]
\[ a = 9+ 6\]
\[a = 15\]