find 'a'and 'b'if 5+2root5/7+4root3=a+broot15
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5+2√5/7+4√3=a+b√15
on rationalizing
5+2√5(7-4√3)/7+4√3(7-4√3)=a+b√15
35-20√3+14√5-8√15/7^2-4√3^2=a+b√15
35-20√3+14√5-8√15/1=a+b√15
on comparing
a=35-20√3+14√5,b=-8
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