Question

do this i need ur help mera paper chal raha hai​

Answer 1

Answer:

using identity a^2-b^2

we will get (√5)^2 - (√2)^2

5-2

3 is the correct answer.

Answer 2

Answer:

We have

$( \sqrt{5} - \sqrt{2} )( \sqrt{5} + \sqrt{2} )$

=

$( \sqrt{5} )^{2} - ( \sqrt{2} ) ^{2}$

$(a + b) \: (a - b)$

=

${a}^{2} - {b}^{2} )$

=

$5 - 2$

=

$3$