Sum and Product Number Finder

<?php

finder(16, 64);

function finder($add,$product)
{

 $inside_root = $add*$add - 4*$product;
 echo("Root = $inside_root\n");

 if($inside_root >=0)
 {

     $b = ($add + sqrt($inside_root))/2;
     $a = $add - $b;

     echo "$a+$b = $add and $a*$b=$product\n";

 }else
 {
   echo "No real solution\n";
 }
}

?>