Question 935674
Ratio?
{{{(16x^10)/(-4x^8)=-4x^2}}}
'
{{{(-4x^8)/(x^6)=-4x^2}}}



General term,  {{{x^6(r^(n-1))}}}
Tenth term and using the found ratio,
{{{x^6(-4x^2)^(10-1)}}}
{{{x^2(-4x^2)^9}}}
{{{-262144x^2(x^18)}}}
{{{highlight(-262144*x^20)}}}