Question

please help.

Answer 1

?

Answer 2

no

Answer 3

Get it now?

Answer 4

Glad I could help! :)

Answer 5

heres my question \[\sqrt{5} \over \sqrt{5}-2\]

Answer 6

still no

Answer 7

is that simplified?

Answer 8

mult by sqrt(5)+2 top and bottom

Answer 9

why do i do that?

Answer 10

and how do i do that?

Answer 11

it's a trick: (a+b)(a-b) = a^2-b^2

Answer 12

do you know FOIL? First, outer, inner , last

Answer 13

yes.

Answer 14

can you multiply sqrt(5)-2 times sqrt(5)+2 ?

Answer 15

This might help you.

http://www.khanacademy.org/video/how-to-rationalize-a-denominator?playlist=ck12.org+Algebra+1+Examples