Answer: 2xsquared + 8x (sorry i cant do the squared symbol on my phone)
Explanation : you need to multiply out the brackets so if you have 2 xs and you are multiply with brackets they then become x squared as there is 2 of them. You get 8x as when you times 2 by 4 you get 8 and as you already have an x there it would have to be 8x. Hope this helps!