(7+3root5) /(7-3root5) rasionalizing
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(7+3root5)/(7-3root5)
= (7+3root5)(7+3root5)/(7-3root5)(7+3root5)
=(7+3root5)^2/49-45
= (49+45+42root5)/4
= (94+42root5)/4
= (47+21root5)/2
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