Step-by-step explanation:
1. Review a given problem : [tex]1+4(3x-10)-12x[/tex]
2.distributive property: [tex]4\left(3x-10\right) = 12x-40[/tex]
[tex]=1+12x-40-12x[/tex]
3. Simplify: [tex]1+12x-40-12x[/tex]
[tex]-39 +12x-12x[/tex]
[tex]=-39[/tex]