Rationalize the denominator and simplify. The variable represents a positive real number.
3 / (√a+8)
3 / (√a+8) nultiply the top and bottom by (√a - 8) and we have
[3 (√a - 8)] / [ (√a+8) (√a-8) ] =
[3√a - 24] / [ a - 64 ]
Thanks CPhill :)