select 
  * 
from 
  homework 
where 
  (id between 1 and 10 or id between 50 and 70) 
  and complete = 1 
  and (title like 'a%' or title like 'b%');

$homeworks = Homework::where(function ($query) {
  $query->whereBetween('id', [1, 10])
     ->orWhereBetween('id', [50, 70]);
})->where('complete', 1)
->where(function ($query) {
  $query->where('title', 'like', 'a%')
     ->orWhere('title', 'like', 'b%');
})->get();