The expression "4 × 10 (x)" represents a multiplication of 4, 10, and a variable $x$.

Simplifying:

$4 \times 10 \times x = 40x$

So, the expression simplifies to $40x$.

Would you like more details or have any questions?

Here are 5 related questions to explore:

1. How would you simplify $3 \times 5 (x + 2)$?
2. What happens if $x = 2$ in the expression $40x$?
3. Can you expand the expression $4x(10 + 2)$?
4. What is the result of multiplying two variables, $4x \times 10y$?
5. How do you factor $40x$ if you know $x = 4$?

Tip: When simplifying, always follow the order of operations, especially when variables and constants are combined.