Question 1018824
the current end behavior is -2x^7.  When x is large +, the term is negative.  When x is large -, the term is positive.
Add -x^8.  When x is large +, the term is negative, and large negative it is negative.
Add 5x^7. Now large x positive will be positive and large x negative will be negative. The graphs of each of those are below.
{{{graph(300,200,-5,5,-2000,2000,-2x^7)}}}
{{{graph(300,200,-5,5,-2000,2000,-x^8)}}}
{{{graph(300,200,-5,5,-2000,2000,5x^7)}}}