Simplify the expression sqrt(7! + 6!), where n! stands for n(n-1)(n-2) ... 2*1.
Sqrt{[7 * 6 * 5 * 4 * 3 * 2 * 1] + [6 * 5 * 4 * 3 * 2 * 1]}
Sqrt{[ 5040] + [720]}
Sqrt{ 5,760}= 2^7 * 3^2 * 5 = 2^6 * 3^2
Sqrt{2^6 * 3^2 * 2 * 5}
2^3 * 3 sqrt{2 * 5}
24sqrt{10} - final simplification.
