derivative rules

Question

For what values of x is the tangent line of the graph of f(x)=8x^3 - 382x + 24

parallel to the line y=2x + 0.1 ?

x =

stuck please help

Answer 1

f'(x) =24x^2 -382 =2

24x^2 = 384

x^2 = 384/24 = 64/4= 16

x = 4,-4