Let's simplify the expression:

$-4(-2a + b)$

1. Distribute the $-4$ to both terms inside the parentheses:

$= (-4) \times (-2a) + (-4) \times b$

2. Simplify each term:

$= 8a - 4b$

So, the simplified expression is:

$8a - 4b$

Would you like more details or have any other questions?

Here are 5 related questions to explore:

1. How do you factor expressions like $8a - 4b$?
2. Can you simplify an expression with multiple variables, like $3x - 4(-y + 2z)$?
3. What happens when you distribute a fraction, like $\frac{1}{2}(4a - 6b)$?
4. How do you handle expressions with powers, such as $2(-x^2 + y)$?
5. What is the distributive property and how is it used in algebra?

Tip: When distributing, remember to multiply both the coefficient and the sign!