Question 166206
Yes, This is correct.  Good job.
{{{g(f(x))=sqrt(1/(9x^2+21x+6))}}}
.
This can also be written as: {{{g(f(x))=sqrt(1)/(sqrt(9x^2+21x+6))}}}
which can be reduced to {{{g(f(x))=1/(sqrt(9x^2+21x+6))}}}