The expression is:

\[
400 \times 0.6^{n+1} - (400 \times 0.6^n)
\]

To simplify this:

1. Factor out the common term \( 400 \times 0.6^n \):
   \[
   400 \times 0.6^n \times (0.6 - 1)
   \]
   
2. Simplify the terms inside the parentheses:
   \[
   400 \times 0.6^n \times (-0.4)
   \]

So, the simplified expression is:

\[
-160 \times 0.6^n
\]

Would you like further clarification or details on this simplification?

Here are 5 related questions you might find helpful:
1. What is the general form for simplifying expressions involving exponents?
2. How do you factor out common terms in a complex expression?
3. Can you explain how to handle negative exponents?
4. What are some practical applications of exponential decay in real-life problems?
5. How do you graph exponential functions and transformations?

**Tip**: When simplifying expressions, always look for common factors first. It often makes the problem much easier to manage!

Learn how to simplify the expression 400 * 0.6^(n+1) - 400 * 0.6^n by factoring out common terms and applying properties of exponents. This problem involves exponential functions and is suitable for students in Grades 9-11.

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