Question 759436


{{{15(2z + 1)^3 + 10(2z +1)^2-25(2z +1)}}}


{{{(2z +1)(15(2z + 1)^2 + 10(2z +1)-25)}}}

{{{(2z +1)(15(4z^2 +4z+ 1) + 20z +10-25)}}}

{{{(2z +1)(60z^2 +60z+ cross(15) + 20z-cross(15))}}}

{{{(2z +1)(60z^2 +80z)}}}

{{{120z^3 +160z^2+60z^2+80z}}}

{{{120z^3 +220z^2+80z}}}