Here's the question you clicked on:
Hollywood_chrissy
Rationalise 1/(1+2sqrt(3)-sqrt(2))
(-13 + 11sqrt2 +18sqrt3 - 4sqrt6) /73
Did you first multiply top and bottom by 1-2sqrt(3)+sqrt(2)
|dw:1351247704457:dw| first multiply this, twhat do you get? *you'll need to rationalize twice
@estudier my text gives the result (1+2sqrt(3)+sqrt(2))(11-4sqrt(3))/73
Yes, I got that as well, then multiplied it out...
So you did you multiply by (1-2sqrt(3)+sqrt(2)) top and bottom.