To simplify the expression 24 - x (19 - x) × 2, we can start by simplifying the expression inside the parentheses:

19 - x

Next, we can distribute the x to both terms inside the parentheses:

19x - x^2

Now, we can substitute this expression back into the original expression:

24 - (19x - x^2) × 2

To simplify further, we can distribute the 2 to both terms inside the parentheses:

24 - 38x + 2x^2

So, the simplified expression is 2x^2 - 38x + 24.