Question

simplify the expression 5+(radical 7)/5-(radical 7)

Answer 1

Multiply by the conjugate of the denominator.
\[(5+\sqrt{7})/(5-\sqrt{7})*(5+\sqrt{7})/(5+\sqrt{7})\]

Answer 2

you should end up with
\[(32+10\sqrt{7})/18 = (16+5\sqrt{7})/9\]