Question

Rationalise the denominator of root7+root5/root7-root5

Answer 1

$\sqrt{7} + \sqrt{5} \div \sqrt{7} - \sqrt{5}$

=

$\sqrt{7 } + \sqrt{5} \times \sqrt{7 } + \sqrt{5} \div \sqrt{7} - \sqrt{5} \times \sqrt{7} + \sqrt{5}$

=

$( \sqrt{7} + \sqrt{5} ) {}^{2} \div \sqrt{7} {}^{2} - \sqrt{5} {}^{2}$

=

$12 + 2 \sqrt{35} \div 2$

Answer 2

hope it helps u....
plzz mark me as brains list....