Question
Which of the following fractions is equal to 1√5−√7?
Answer: Option B
:
B
Rationalizing the expression we get,
1√5−√7=√5+√7(√5−√7)(√5+√7)
=√5+√7(√5)2−(√7)2
=√5+√75−7
=−(√5+√7)2
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:
B
Rationalizing the expression we get,
1√5−√7=√5+√7(√5−√7)(√5+√7)
=√5+√7(√5)2−(√7)2
=√5+√75−7
=−(√5+√7)2
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