The expression $4a^2 - 2a^2$ simplifies as follows:

$4a^2 - 2a^2 = (4 - 2) a^2 = 2a^2$

So, the simplified form of $4a^2 - 2a^2$ is:

$2a^2$

Would you like further details or have any questions?

Here are 5 related questions:

1. How do you add and subtract like terms in algebraic expressions?
2. What are the properties of exponents and powers in algebra?
3. Can you expand and simplify an expression like $(3a + 4)(a - 2)$?
4. How would you solve $2a^2 = 8$ for $a$?
5. What happens when you multiply algebraic terms like $2a^2 \times 3a$?

Tip: Always ensure the terms you're combining have the same variables and powers for accurate simplification!