Final answer:
To find the coefficient of x in the given expression, add the like terms of x together to get 8x. The expression then becomes 8x + 8. The coefficient of x is 8.
Step-by-step explanation:
To combine the terms and find the coefficient of x in the expression 3x + 8 + 5x, we can add the like terms together. The like terms are 3x and 5x, which give us a total of 8x. The constant term is 8. So, the expression becomes 8x + 8. The coefficient of x is 8.
Learn more about Combining like terms in an algebraic expression