What denominator do we obtain after rationalizing the denominator of 4
/ 7 √5−5√ 7
?
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4/(7√5-5√7)
4/(7√5-5√7)×(7√5+5√7) / (7√5+5√7)
4(7√5+5√7) /(49×5-25×7)
so,the denominator is 245-175= 70
4/(7√5-5√7)×(7√5+5√7) / (7√5+5√7)
4(7√5+5√7) /(49×5-25×7)
so,the denominator is 245-175= 70
Dipty:
very helpful!
thanqq very much...
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