# How do you simplify the expression 4a+2b+a?

$5 a + 2 b$
When you simplify an equation, always check for like-terms. $4 a$ and $a$ both share a common variable, $a$. This makes them like-terms. You can add like terms, creating the sum of $5 a$. $2 b$, having no term to be able to be added to, stays the same.