Question 862126
All three terms show addition operation, and no negative sign nor subtraction found.  Arrange as {{{2a^2+3a+1}}}.  One obvious binomial factor combination is.


{{{(2a+1)(a+1)}}}.  
Can you think of any other combination?  You want the leading terms of each binomial to give product of {{{2a^2}}}, and you want the constant terms of the binomials to have product of 1.  You want to check to see that the resulting terms of a will sum to 3a.  Certainly they do.