Respuesta :

[tex]\boxed{\sf a(b+c)=ab+bc}[/tex]

[tex]\\ \rm\longmapsto 10(x+5)[/tex]

[tex]\\ \rm\longmapsto 10x+10(5)[/tex]

[tex]\\ \rm\longmapsto 10x+50[/tex]
10(x+5)
10x+10(5)
10x+50x
=60x