Question 34162
Area is defined as L*W
so factor the area that is represented by the trinomial
{{{ 6a^2+7a+2 }}}
{{{ (3a+2)(2a+1) }}}
Perimiter is defined as 2(L+W) 
so plug in the L and W that you factored
{{{ 2(L+W)=P }}}
{{{ 2((3a+2)+(2a+1))=P }}}
Add the terms in the parenthesis
{{{ 2(5a+3)=P }}}
Distribute
{{{ 10a + 6 = P }}}
Without a value for a ... you are finished