Question 331472
{{{sqrt(245k^7q^8)}}}
Factor inside the radical to reveal perfect squares
{{{sqrt(49*5*k^2*k^2*k^2*k*q^2*q^2*q^2*q^2)}}}
Extract the square root of each perfect square
{{{7*k*k*k*q*q*q*q*sqrt(5k)}}}
which is
{{{7k^3*q^4*sqrt(5k)}}}