Resposta :
[tex]IZ\\\\x^2+2ax+a^2+5x^2+3ax+4a^2\\\\=x^2+5x^2+2ax+3ax+a^2+4a^2\\\\\mathrm{Somar\:elementos\:similares:}\:a^2+4a^2=5a^2\\\\=x^2+5x^2+2ax+3ax+5a^2\\\\Somar\:elementos>2ax+3ax=5ax\\=x^2+5x^2+5ax+5a^2\\\\=6x^2+5ax+5a^2[/tex]
[tex]IZ\\\\x^2+2ax+a^2+5x^2+3ax+4a^2\\\\=x^2+5x^2+2ax+3ax+a^2+4a^2\\\\\mathrm{Somar\:elementos\:similares:}\:a^2+4a^2=5a^2\\\\=x^2+5x^2+2ax+3ax+5a^2\\\\Somar\:elementos>2ax+3ax=5ax\\=x^2+5x^2+5ax+5a^2\\\\=6x^2+5ax+5a^2[/tex]