To solve the equation 4(x + 5) + 4x + 8 you must first distribute the 4 to the numbers inside the parentheses, which would be x and 5...
(4*x) + (4*5) + 4x + 8
4x + 20 + 4x + 8
Now you must combine like terms. Like terms are numbers that have matching variables OR are numbers with out variables. In this case the like terms are 4x and 4x; like terms are also 20 and 8:
4x + 4x = 8x
20 + 8 = 28
8x + 28
^^^This can not be "solved" because it is an expression (without and equal sign), but it can be simplified to what is shown above
Hope this helped!
~Just a girl in love with Shawn Mendes