Express with integer denominator: 1/(sqrt2+sqrt3+sqrt5)
ahohen_77 Uni Student Joined Feb 6, 2004 Messages 37 Location Newtown Gender Male HSC 2005 Mar 24, 2004 #1 Express with integer denominator: 1/(sqrt2+sqrt3+sqrt5)
E Estel Tutor Joined Nov 12, 2003 Messages 1,261 Gender Male HSC 2005 Mar 24, 2004 #2 Rationalising the denominator: 1/(rt2+rt3+rt5) =[(rt2+rt3)-rt5]/[(rt2+rt3)^2-5) =[rt2+rt3-rt5]/[2rt6] =[2rt3+3rt2-rt30]/12
Rationalising the denominator: 1/(rt2+rt3+rt5) =[(rt2+rt3)-rt5]/[(rt2+rt3)^2-5) =[rt2+rt3-rt5]/[2rt6] =[2rt3+3rt2-rt30]/12
ahohen_77 Uni Student Joined Feb 6, 2004 Messages 37 Location Newtown Gender Male HSC 2005 Mar 25, 2004 #3 ok i dont undertsand this line: =[rt2+rt3-rt5]/[2rt6]
ahohen_77 Uni Student Joined Feb 6, 2004 Messages 37 Location Newtown Gender Male HSC 2005 Mar 25, 2004 #4 coz (rt2 +rt3)^2 - 5 turns out to be 5+2rt6
ahohen_77 Uni Student Joined Feb 6, 2004 Messages 37 Location Newtown Gender Male HSC 2005 Mar 25, 2004 #5 oh oops..sorry how stupid of me
