To simplify the given expression, the first step is to open the parenthesis by multiplying each term in the parenthesis by the term outside of the parenthesis. It becomes
4x + 20 + 4x + 8
Next step is to add like terms. We would do this by adding each term containing x together and also add the constants together. It becomes
4x + 4x = 20 + 8
8x+ 28
Since 4 is a common factor of both terms, we would factorize 4 out. It becomes
