Question 884644
No, your signs are off.
{{{(x^2-x)(2x+1)=(x^2-x)2x+(x^2-x)}}}
{{{(x^2-x)(2x+1)=(2x^3-2x^2)+(x^2-x)}}}
{{{(x^2-x)(2x+1)=2x^3-x^2-x}}}