First you need to distribute : -4x + 8x - 3
Combine like terms : 4x -3
8. Im assuming you want to:-
Simplify -2x(2 - 4x ) - 3
Distributing the -2x over the parentheses:-
= -4x + 8x^2 - 3
= 8x^2 - 4x - 3
