Question 699580

{{{25a^2-23a-2}}}....replace {{{-23a}}} with {{{2a-23a}}} 

{{{25a^2+2a-25a-2}}}...group

{{{(25a^2+2a)-(25a+2)}}}

{{{a(25a+2)-(25a+2)}}}

{{{(a-1)(25a+2)}}}