Question 541672
{{{sqrt(10a)}}} + {{{2*sqrt(40a^3)}}} 
:
Factor the 2nd term inside the radical to reveal some perfect squares
{{{sqrt(10a)}}} + {{{2*sqrt(4*10*a^2*a)}}}
:
Extract the square root of those perfect squares
{{{sqrt(10a)}}} + {{{2*2*a*sqrt(10a)}}}
{{{sqrt(10a)}}} + {{{4a*sqrt(10a)}}}
:
Factor out the square root of 10a
{{{sqrt(10a)}}}(4a + 1)