HELP!! i need help with these Q1 Show that: Ö2+1 ----- = 3 +2Ö2 Ö2-1 Q2 Ö5-1 ----- = 3+Ö5 Ö5-2 Q3 express : in the form kÖ5 1 1 ---- - ---- 3Ö5 2Ö20
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Multiply the first by (sqrt(2)+1)/(sqrt(2)+1) to get (sqrt(2)+1)^2/((sqrt(2)-1)(sqrt(2)+1)) = (sqrt(2)+1)^2/(sqrt(2)^2-sqrt(2)+sqrt(2)-1) = (2+2sqrt(2)+1)/1 = 3+2sqrt(2) The second and third go in exactly the same way.
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