Question

Fid the value of root 5 +root 2×root 5-root 2

Answer 1

√5 + √2 * √5 - √2

√7 * √3

√21

Answer 2

$(\sqrt{5 } + \sqrt{2} ) \times ( \sqrt{5} - \sqrt{2} )$
Using Identity
${x}^{2} - {y}^{2} = (x + y)(x - y)$
Here ......

x denotes $\sqrt{5}$and y denotes $\sqrt{2}$

Now.........

$(\sqrt{5 } + \sqrt{2} ) \times ( \sqrt{5} - \sqrt{2} ) \\ = > { (\sqrt{5} )}^{2} - {( \sqrt{2}) }^{2} \\ = > 5 - 2 \\ = > 3$