Question 1204144


{{{(25a^5-5a^4+15a^3-5a) / (-5a)}}}...easiest way is to factor out {{{-5a}}} from numerator


={{{(-5a(-5a^4+a^3-3a^2+1)) / (-5a)}}}


={{{(cross(-5a)(-5a^4+a^3-3a^2+1)) /cross( (-5a))}}}


={{{-5a^4+a^3-3a^2+1}}}