Question 489048
{{{-3w^2 + 6wz - 10z^2 + 5 (4w^2 - 2wz - z^2)}}}


{{{-3w^2 + 6wz - 10z^2 + 20w^2 - 10wz - 5z^2}}}


{{{(20w^2-3w^2) + (6wz - 10wz)- 10z^2 - 5z^2}}}



{{{17w^2- 4wz- 15z^2 }}}



{{{17 w^2-z(4w+15z)}}}