Question 339453
{{{(2x+1)(x^2+2a+5)= (2x)(x^2+2a+5)+(1)(x^2+2a+5)}}}
 {{{(2x+1)(x^2+2a+5)= (2x^3+4ax+10x)+(x^2+2a+5)}}}
{{{(2x+1)(x^2+2a+5)= 2x^3+x^2+2(2a+5)x+(2a+5)}}}