Question 311017
Factor the numerator,
{{{z^2+10z+16=(z+2)(z+8)}}}
Substitute,
{{{(z^2+10z+16)/(z+2)=((z+2)(z+8))/(z+2)}}}
{{{(z^2+10z+16)/(z+2)=(cross(z+2)(z+8))/cross(z+2)}}}
{{{highlight_green((z^2+10z+16)/(z+2)=z+8)}}}