Check whether both the expressions are equal or not.
 
1. \(21 \times (15 + 10)\) and \(21 \times 15 + 21 \times 10\)
 
The above expressions are .
 
2. \(4 \times (15 - 10)\) and \(4 \times 15 - 4 \times 10\)
 
The above expressions are .