Posted by Megan on Friday, November 4, 2011 at 3:18pm.
Rationalize the denominator: 5 /4squareroot 5
(five over four minus square root five)
Please explain

Algebra  Steve, Saturday, November 5, 2011 at 5:38pm
since (ab)(a+b) = a^2  b^2,
(4sqrt(5))(4+sqrt(5) = 165 = 11
so, multiply top and bottom by 4+sqrt(5) to get
5(4+sqrt(5))/11 = (20 + 5sqrt(5))/11 
Algebra  Megan, Saturday, November 5, 2011 at 10:00pm
Thank you so much!! It really helped me understand!