Find the square root of  $$ {k+l+m+n+2\sqrt{ml+mk}+2\sqrt{mn}+2\sqrt{kn+ln}}$$

If $$ {3^{a+3}×4^{a+6}×25^{a+1}\over{27}^{a-1}×8^{a-2}×125^{a+4}}={4\over15^{26}}$$ then the value of $$ {\sqrt{a+9}}$$.

What is the value of $$ {\sqrt{625}+\sqrt{484}}$$

The sum of two positive numbers is 20% of the sum of their squares and 25% of the difference of their squares. If the numbers are x and y then, is equal to

$$ {\sqrt{8\ {^{3}\sqrt{729}}}=?}$$

Find value of $$ {^3\sqrt{\sqrt{0.000729}}}+^3{\sqrt{0.008}}$$

Find the value of the given expression.

 $$\sqrt { 8+\sqrt { 1681} \ } \ $$

if $$x=\sqrt {64}+\sqrt {121}-\sqrt {169}$$, the find the value of x²