Question

rationalise and the denominator of under root 7 minus under root 5 upon under root 7 + under root 5​

Answer 1

Hey mate !!!

Here is ur answer..

√7-√5 / √7+√5

Then by rationalizing the denominator

=√7-√5 / √7+√5 * √7-√5 / √7-√5

= (√7-√5)² / (√7)²-(√5)²

= 7-2√35+5/7-5. ------ by (a+b)² = a²+2ab +b²

= 12-2√35/2

=2(6-√35)/2

= 6-√35

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