Question 1176624

 the simplest expression for the perimeter of the triangular roof truss:

{{{a=3a+4 }}} 

{{{b=2a-7  }}}

{{{c=5a^2+a}}}

{{{P=a+b+c}}}

{{{P=3a+4 +2a-7+5a^2+a}}}

{{{P=5a^2 +6a -3}}}