Question 865418
{{{17/r - 8/r^2}}}


That may already be simplified, but if you want to perform addition, the lowest common denominator is {{{r^2}}}.


{{{(17/r)(r/r)-8/r^2}}}
{{{17r/r^2-8/r^2}}}
{{{highlight((17r-8)/r^2)}}}, NOT simplified.