Standard practice
A coefficient multiplies the whole grouped value.
Evaluate 4(x + 3) when x = 2.
Parentheses group a sum into one value. The coefficient multiplies that whole value, not only the variable.
Problem 1 of 9. Activate, study a model, try guided items, work independently, apply, and reflect.
Evaluate 4(x + 3) when x = 2.
Support frame: (2 + 3) × 4