Question 565578
What is the answer to {{{sqrt(16) + 3sqrt(8)}}} 
you know the square root of 16 is 4, factor the square root of 8 to reveal a perfect square:
4 + {{{3sqrt(4*2)}}}
Extract the square root of 4
4 + {{{3*2sqrt(2)}}}
which is
{{{4 + 6sqrt(2)}}}