Question 1087608


{{{5a^2+12a+7+(a+1)}}}

{{{5a^2+5a+7a+7+(a+1)}}}

{{{(5a^2+5a)+(7a+7)+(a+1)}}}

{{{5a(a+1)+7(a+1)+(a+1)}}}

{{{(5a+7+1)(a+1)}}}

{{{(5a+8)(a+1)}}}