Im trying to find when x = 1 what is the deritiave of the function g(x) = 2x^2(4x+1)^3

What I got so far was g `(x) = 3(4x+1)^2(4) + 4x(4x+1)^3

= 300 + 500

= 800

This is apparently the wrong answer but I don't know what I am doing wrong. Any help/advice would be appreciated.

Thanks