Respuesta :

Answer:

-10

Step-by-step explanation:

[tex]a^{2} +(10+10)a+100[/tex]

[tex]a^{2} +10a+10a+100[/tex]

[tex]a(a+10)+10(a+10)[/tex]

[tex](a+10)(a+10)[/tex]

so,a=-10