What is the result of 9 - 2(3 + 1)?

To solve the expression 9 - 2(3 + 1), it is important to follow the order of operations, commonly remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).

First, solve the expression within the parentheses:

3 + 1 equals 4.

Next, substitute this result back into the original expression, yielding:

9 - 2(4).

Then, perform the multiplication:

2 times 4 equals 8.

Now, substitute this result back into the expression:

9 - 8.

Finally, perform the subtraction:

9 - 8 equals 1.

Thus, the correct answer to the problem is 1.