Question 185348
{{{(3x+1)^2=(3x+1)(3x+1)=(3x)(3x)+(3x)(1)+(1)(3x)+(1)(1)=9x^2+3x+3x+1=9x^2+6x+1}}}



So {{{(3x+1)^2=9x^2+6x+1}}}