@@prodigykeith9191 I got it...when you differentiate whats inside the bracket means (3x-1) the answer is only 3 dy/dx 3x = 3 dy/dx -1 =0 since its a constant...
can you please tell me if that's because of the bracket or what ?????? I can't seem to understand why it's a six when the rest have been 2 or whatever is in the bracket?? thank u