Question 252922
combine the radicals below. show your steps.
--
11. 4 and square root of 11 + 8 and square root of 11
I think you mean
{{{4*sqrt(11) + 8*sqrt(11)}}}
Think of sqrt(11) as X.
{{{4X + 8X = 12X}}}
So, we get
{{{12sqrt(11)}}}
--
12. square root of 80 - square root of 5 
{{{sqrt(80) - sqrt(5)}}}
{{{sqrt(80) = sqrt(5*16)}}} = {{{sqrt(16)*sqrt(5) = 4*sqrt(5)}}}
So, 4*sqrt(5) - sqrt(5) = 3sqrt(5)