Respuesta :

Photon
[tex]8b^{3} c^2+4b^{3} c^2[/tex]
[tex]= (8+4) b^{3} c^2[/tex]
[tex]=12 b^{3} c^2[/tex]

Be carefully, normally there is no a in your expression. I think you made a mistake.

Hope this helps !

Photon