Surds Help

[Homer J]

Having a mind blank I know these questions aren't too complicated but i need help please :

√8-2√3 * √8+2√3     (there should be a continuing line from the square  root sign before each 8 so its a surd within a surd)


(3/√5 - 3) - (2√5/√5 + 3 )


cheers

[Pixon]

√8-2√3 * √8+2√3
=root( (8-2√3)*(8+2√3) )
=root( 64-4*3) <--DOPS
=root(64-12)
=root(52)
=2root(13)

(I may not have understood your question... :/)

Edit: oh missed the second question

(3/√5 - 3) - (2√5/√5 + 3 ) <----what kind of question has 2√5/√5? isn't that just 2?
=3/√5 - 3 - 2 - 3
=(3root5)/5 - 8

[Homer J]

Thanks Pixon for the help

For question 2 its (3/(root 5 minus 3)) - (two root five/(root 5 plus 3))

[brightsky]

[Homer J]

thanks

[Pixon]

Yeh...we should both learn Latex some time.

[Stroodle]

Yeh...we should both learn Latex some time.

Or just use this: http://www.codecogs.com/latex/eqneditor.php 

[Pixon]

Yeh...we should both learn Latex some time.

Or just use this: http://www.codecogs.com/latex/eqneditor.php 

lol... funnily enough I posted that link in another thread 20mins before writing up the solution on this thread. Fail laziness on my behalf.